hi lilia...
my daughter was/is the same, if i'm lucky enough to get her to nap nowadays, i found the simplest, cheapest failsafe way (in my experience), is her in the middle of the bed, surrounded by a nest of pillows. this is what i always did, and though she is now three, still do, without incedent, making sure her movements were within earshot(via moniter, if i'm busy with the dishes,laundry, or other task which may comprimise my hearing - or simply, through an open door if i'm relaxing or seeing to a quieter chore, bills, dusting, etc., by the time she is physically capable to successfully manuver from out of the nest without stirring up those "no longer sleeping, and something may be amiss sounds", she'll have learned how to slide herself down off your bed, or know that she can't get down without falling, in which case she will scream or somehow signal for help, fully aware of what may happen if she tries on her own and fails, her fear will keep her from crawling off, but not from attempting new ways to dismount eventually, whch she would have come accross without napping in your bed. other than barring her from your room and bed until shes like 2 1/2 or 3, and has mastered climbing up the playground slide, and coming down the ladder, so you're sure she can safley get on and off your bed, you've just gotta let some things happen knees are gonna get scuffed, face plants while running are bound to occur complete with your uncontrolable urge to vomit, she'll fall off her bike, probably even break a bone or two, i know, sick to your stomach right...but be thankful, very rarely do these milestones in the physical injury realm ever mame or cripple our kids; blood, tears (theirs and ours), consoling and pretty quick, it's healed...all better! the real boo boos, those horrible scaring boo boos, never come from a mommies bed and a childs subsequent tempting fate senario, and these are the booboos we spend our parenthood fearing, so much time spent over what if not for the small scar on her chin, in twenty years we would have no memory of. the real pain, the stuff that breaks a little girls spirit, and as parents their is no band aid made for, are those things we have no control over, there is no failsafe, or quick fix, and no amount of preparation will ever suffic in making any of these real booboos less likly to occur or quicker and easier to heal, and these booboos are what we as parents spend most of our time tending to; soothing, supporting, and streangthening, a childs soul, is our first priority, and in twenty years you'll remember the name of the little girl who told your daughter "you can't play with us, we don't like you", the exact time she burst through the front door in tears beacause all the boys at school were teasing her, the very date she didn't make the dance team and what intersection you were stopped at for a red light when the most inconsolable sobbing erupted from the backseat, how she hung up her cell phone pressed it two her forhead slowly flopped her body down burying her face in the seat next to her, turned her head slowly toward youj her eyes desparetly searching yours and her beautiful sad face as she wailed "mommy...derek broke up with me, why doesn't he like me anymore, what's wrong with me, he hates me, mom, why?" what first aid kit comes equipt to triage a broken heart, fall from bed? sure, lists of proven treatments, pain alieviation, infection protection, and more!!! worry less, live more, and one day when you've got nothing really important going, find out where derek works and somehow get him fired.
while she's napping or nesting whatever the case may be grow a child strong of soul and spirit, who can take a hit without its return, who can fall gracefully without fear of falling again, can love without stipulation, hate without diminishment, forgive without forgetting, laugh without reservation, learn without too many mistakes, and live without regret, never would we say...without falling off the bed. right?
good luck finding what works best for the both of you, whatever it may be and cherish those naps, for the taking of them will one day come to an end, your days of a guiltless two hour respite will not last forever.
enjoy eachother,
aline