Good morning Sophie,
So glad to have a new member here everyone here has excellent advice to give. I have a 5 month old rehome i have had her about 3 weeks now. It took her some time to settle in but she is adjusting fine. She too was on a bad diet she is slowly accpting all kinds of veggies and a few fruits. What is the name of your fid? If you have time we would love to see some pictures of your new family member. Hope to talk to you soon and Welcome!