You are going to have to be very careful with her because of this - the stress of it alone .... rabbits can die from stress. Did they shave the underneath of her feet and legs, as in the bits touching the floor?
I already waxed one brothers legs...xD but anyways, they arent allowed near my animals, i have stinky girl deodorant and pepper spray if they ever try to hurt me or my animals...
They only shaved her body, not her head, tail, bum, girly parts, nor legs. They didnt shave the bits touching the floor.
She is too young to be away from her Mother - I can tell that at a glance. You need to keep stress to a minimum, dont hold her or play with her - rabbits are experts at hiding stress and illness, as prey animals. Leave her in a quiet place, with a hiding place, a bowl of water and some hay. Give her a soft fleece blanket to lie on - I imagine carpet will irritate her skin. Feed her only the pellets she is used to, nothing new. Give her unlimited pellets for now - if a rabbits gut becomes empty they can go into stasis and die. Get down to the pet shop as soon as it opens and get her some hay, lots of hay. Dont feed her veg. I would also be wary about chaff, it is a food for horses and I believe it is richer than hay. See if you can find out where they got her from and go to that shop and ask what she was fed on - if they give you any advice check it on here first though - they are NOT reliable or responsible if they are selling baby rabbits that young.
Okay, i thought that hiding the stress might be the case(some horses do this too, ive worked with quite a few horses that hide their emotions). i will try keep her in her cage at all times? She does get VERY curious and want to come out though, and when she was out today she was going around slowly most of the time and sometimes having a few hops and jumps(not very big though)...
The chaff was pre mixed into the pellet feed? Ill try get a picture of it but it's one of those clear plastic bag ones from the vet that i think the vet might have the info or whatver? it isnt on the bag... Im gonna guess it's like a starter mix for small/young bunnies? GUESS only.. Ill try see whether my brothers can remember where they got her from, it sounds like it was a home...with an unspayed female irresponsible..
I would not use the heat lamp. Room temp is hot enough and you could easily burn her skin. It wouldnt be so much of a problem if she had fur.
Can you find the brand of food you are using online and link me to it? Would be good if you can post the nutritional information too.
What are her poos like, can you take a picture without disturbing her, with something for scale?