Where are you from?
You could try one of these but they are only available in the US. (I have looked everywhere in the UK, but had to get a work colleague to bring one over in the end)
TBH, now the novelty has worn off she doesn't want to climb out anymore, but some have lovered the cot base. (home DIY may be required, ie new holes etc) I know that lots have had success with this and it's not that difficult to do. Or, some put plenty of padding at on the floor. I wouldn't move her to a big bed if I didn't think she was ready.
For naps you could try a different place, perhaps a mattress on the floor, it may take time to readjust but at least she will be safe.