Tank size can also be a factor on mood and stress. The first terrarium I got was too small (pet store said it was fine) but I quickly upgraded and Frodo became more active and hungry. For a Whites tree Frog you want a 20gallon tall terrarium. Rule of thumb is 1 frog per 10 gallons but whites are bigger and need larger space...
You could try a natural honey bath with repti boost. I have read al ot about them helping with impaction and appetite. There are many posts on here with the exact method for this bath if you search it on here.
I wouldn't handle her too much the first while you have her an new move and environment can be stressful. Are there lots of climbing branches or plants? Any lighting?
Temp should be 80'F to 90'F
Humidity also in the 70% to 80% area.
Those 2 factors are huge in the health of any frog always have the right temp and humidity level its different for every species. (make sure your gauges are accurate)
Here is a link to the Whites care sheet on here it might help. Frog Forum - White's Tree Frog Care - Litoria caerulea