How old is the little girl?
If she can climb out of the pack and play and refuses to stay in it, she's too big and/or too old for it.
I never had that problem with my son and personally think the tents are a bit ridiculous. I moved my son into a toddler bed at 15 months and he did fine. He also slept on a cot at daycare without issue. At first he didn't want to stay on the cot but after being put back on it a few times, he got the hint.
If the mother has lowered the mattress as low as it will go and the child still climbs out of the crib, then the child needs to be in a toddler or twin bed for safety's sake. A fall from the crib is a lot higher than a fall from a toddler or twin bed. It won't be long before she figures out how to escape the tent... they are little houdini's!