Try a small adult mouse. I have found my asians all tend to like thinner prey then they are capable of.

I just got Tai (now 14 months and 6+ feet, got to get yall some pics) onto sm/med rats. He would eat 5 mice I bet but just took a while to be willing to do the work for a bigger feed. Poor girl being sick you are going to have to move her up, if small mice rats don't work go to hoppers, etc. Just get off the pinks or you are going to be mortgaging the house to pay for her habit,

Anyway glad she is doing better,