I don't think so...
I don't think she was gravid before I mated her, before I mated her she was very skinny. She was eating around 2-3 crickets a day but she had no meat on her, when she was basking you could see what looked like her ribs.
I mated her about a month ago and ever since she has been slowly gaining weight.
She stopped eating for about a week all together once I took her out of the males enclosure. She ate when she was in it, so I was a little worried, but she is eating anywhere from 1-5 a day now (1-2 being a day she ate 4+ the day before). I did not see them mate, I kept my distance as much as I could because I have heard that if they are mating and someone is around they would stop.
This is my first time having and breeding chams, but I have done a vast amount of research, so I know a good bit about caring for them, and what I need to know about her being gravid.
The main thing about Jacksons I can't find anywhere online is how to tell if they are gravid, I have seen a good bit of people saying its very hard to tell until she gains so much weight you could actually tell she is.