Also remember that breeding can take 4-8months to build. Just be patient, It sounds like she's still building her follicles, keep trying to offer food too, even if its a smaller meal than normal so she knows there is food available if she reproduces offspring.
I noticed that sometimes if food isn't being offered like normal they could re-absorb the follicles too (i think that happened to one of mine this season) Keep an eye on her weight to make sure she isn't losing too much too quickly.
Here's the chart I like to use
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