You said she's in a tank. Did the breeder keep her in a rack/tub system? A friend had one that had been a "tub girl" all her life, he got her and put her in a tank and even with hides she wouldn't eat for several weeks and her prior owner said that she rarely skipped meals. My friend eventually moved her into a 41 qt sterilite tub, observed "hunting" behavior from her that same evening, offered a f/t rat, and she hit it immediately.