I would suggest to have her try a menstrual cup, (one of the reusables not the disposable one) There are many different ones, I included some links below.
I found out about these about 10 years ago, and I will never go back to pads/tampons! These are so good they almost make you forget you are having a period, and they only have to be emptied at moring and bedtime (sitting on the toilet or int he shower, just pull out, dump the blood, rinse,a nd re-insert - wash with mild cleanser and water inbetween cycles - the silicones ones can be boiled to sterilize). Even for me on my heaviest days, and I have very heavy periods, I may have to empty 3 times in 24 hours on my worst day. I wish I had known about these as a teen starting my period at 10 years old....they don't go WAY up there like tampons ( which I could always "feel" no matter how well I inserted), and they are flexible, and I have only had two times of leaking in 10 years of use!! Since they "catch" and don't absorb the flow, they don't dry you out down there, so that way you don't have the horrible DRY feeling of trying to get in another tampon after taking out one!
You can find many trypes online, and most have two sizes, a smaller one for pre-childbirth and one for after or for those over 30 years old. These are safer (no TSS risk), more comfortable, and easier to use than tampons, and also better for the environment and cheaper over the long run - they pay for themselves in less than a years worth of use, compared to what you'd spend on pads/tampons, and you can use them for 10 years! Here is a page about the cups in general: http://sew-in-love.com/menstrual-cups.html and here are some different methods for folding to insert them http://community.livejournal.com/menstrual_cups/453392.ht...
Here are a few of the cups' sites:
http://www.divacup.com
http://www.keeper.com/
http://www.lunettecup.co.uk
http://www.miacup.co.za
http://www.mooncup.co.uk
I have owned 3 cups, my first was the original gum rubber "Keeper", it served me well for 4 years, then i heard about the medical grade silicone cups...I bought a Divacup, but i preferred my Keeper, and kept using it for 2 more years (the Divacup was too "Soft" and was more difficult to get it to "pop open" after folding it to insert). Then after my first pregnancy, I bought a Mooncup UK, and that is what I am still using now, 3 years later after my second baby.
Anyway, I hope you will let her try this, and maybe try one yourself, I SWEAR, it is the MOST COMFORTABLE AND CONVENIENT way to deal with a period that exists. Maybe you two to learn about these and try something new together, then she won't feel so "alone" since Mom is new to this product too!!!
Good Luck!
Jessie