How long have you had her? Most BPs go into a period of fasting, mine will not eat from Nov-Jan every year and she`ll be three this year.
It`s nothing to worry about as long as there`s no significant weight drop and your temps are right. Do offer her food on normal schedule though and she`ll eat when she decides to.
I forgot, please avoid gerbils because if your BP like them, it will be difficult to switch her back to mice/rats.