First off, welcome! I really like your enclosure, nice naturalistic setup. One thing you might want to try is blacking out 3 sides of the tank and/or cluttering up some of the free space. Your humidity and hot spot look good, but I would bump up the cool side a bit. I like to keep mine at 80-82. Sometimes they won't eat if it's too cool.
Also, she looks a bit thin for a 1.5 year old. She definitely looks like she can take down an adult mouse. Would you be able to get a weight on her? That would really help to recommend the correct size feeder. I would try again with an adult mouse after blacking out/cluttering her enclosure, and if still no go with that, try for a freshly weaned rat. It'll be much cheaper in the long run to feed a good sized rat over multiple miceGood luck, I hope she eats for you soon!
Feel free to ask any other questions you might have!
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