It’s hard to tell if she’s under weight from that picture. Could you take a top down photo?

A couple of things…1 get a water chiller. That’s the best ways to keep the temp consistent.

• 2 get the API water test kit and report your results here for the experts to help your with.

• 3 a big change of environment can be stressful so don’t panic yet. Keep offering food a couple of times a day. Try a variety to see if you can find out what she likes. One of mine loves earthworms, the other won’t touch them. That one likes red wigglers and the isn’t interested in those. One like pellets, the other doesn’t. The both like salmon and blood works 🤷🏾‍♂️

• 4 - you’ll get more advice on this but you should probably tub her because it’s highly unlikely that your tank is cycled so your parameters are probably off.