Hi
My Female Viper is presently off her food..... She stopped in Novemberish time.... She did this last year also.... Started back around March/April ish.
I recently got a WC male... which didnt feed for a little bit for me... I eventually enticed it with live twice then fresh killed twice, now hes happily on frozen thawed.
As your girlie sounds quite big she may be doing her yearly fast.
Hope something of that may help
Denise