Thanks for the update.
Warts are not that common in rabbits, but there is a virus (Papilloma virus) that can cause wart-like lesions in rabbits. It is more common in wild rabbits, but could affect a domestic rabbit. If this is the case, the often go away, but in some cases, they can worsen or rarely, become a skin cancer.
If you live in California or Oregon, there is a condition called myxomatosis which is spread from insects bites. Some rabbits will form a nodule where the insect bites them. However, most animals with this condition are very sick with other signs, so this would be less likely.
Rabbits also get skin abscesses commonly, but this would be a nodule or mass under her skin so again, this does not sound like what is going on. The area might also be painful, warm to the touch or with discharge over the area.
So, from your description, it sounds like it is mostly likely the papilloma. Since I am unable to diagnose her online, having a good hands on exam is the best. In rabbits, things can change quickly so it it does need to be monitored closely. If you do not have a vet, you can go to www.rabbit.org
. Both of these sites have vet look up areas.
Please let me know if you have any more questions.