I wouldn't count her out yet. If her follicles are that big and she is continuing to "gain weight" despite being off feed, then I would guess she is going to go for you this year.
My 1st year I bred a girl in January and didnt get eggs until August.
I am having the same thing happen with a virgin girl this year. She developed huge follicles after being paired with a fire in february with NO visual looks. She just recently went off feed after her last shed so I am hopeful that they got the job done.
When I palpate I can still feel the follicles but I have not witnessed an ovulation yet or I just missed it.
Keep your hopes up, she will go for you eventually.
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