I don’t know what to do about my rabbit

Hello I made a list of things that describe my pet rabbit. Her name is Camilla and she is not doing to well and I don’t know what to do.

* Hasn’t been eating her food (only eats a little bit)
* Been like this since our other rabbit died (she was doing ok before but she has not been doing well for around 2 weeks) (other rabbit died in late November)
* Since her friend died she has been going to the bathroom outside of her litter box so her cage gets dirty quickly (she was never really good at using the litter box but it has gotten worse)
* I clean her cage once every week or at least I try to
* She gets a bowl of salad, 3 raspberries, 2 sticks of celery, and a big carrot for food at night.
* Gets a big thing of hay but she used to use it as a bathroom
* Hasn’t had pellets for a little while because I didn’t have the time to buy any but I just bought some
* I got Camilla from a friend at school and I don’t know how old she is
* She has been having a lot of diarrhea
* She looks like she is in pain
* She was limping and wasn’t using her left back leg
* Her legs and butt look really bad because she keeps peeing on them
* Shifts a lot when she is just sitting
* Haven’t been giving her a lot of attention because of work and school
* Doesn’t want to move
* Doesn’t struggle when I pick her up
* Sometimes she gets to have treats, peppers, or a part of a banana
* I feed her Timothy hay and I give her a variety of stuff in her pellets
* She hasn’t been drinking a lot of water so I gave her another water dish
* I cleaned her cage last on February 3rd but it is a mess now

cut out the salad, berries, and treats, give half of the carrot.
give her some green onions.. if she eats that ,-give her a clove of garlic each day..
see if her GI issues improve.
--the back leg thing,loose poop, and peeing on herself,-- is worrisome..
If it is EC,[or coccidiosis]... she will eat the onions , and then the garlic ,
If she will eat it,- it will help with the symptoms..

there are other herbs that will help diarrhea , [like raspberry leaves-and i am sure others can/will chime in on that].. but first see if the "cause " can be addressed..