i have a female pastel who NEVER eats (at least it feels like never). she will eat once a month, if i'm lucky. that's offering LIVE too. in the 2 years i've had her she's had f/t maybe twice. she even refuses live ASF's.
so i most definitely feel your pain!
my advice is to maybe take the snake out and let it roam for about 10 minutes before you offer food. with Sage (my troublesome pastel girl) she pretty much instantly balls up when i slide open her bin, so sometimes it helps if i handle her for awhile so she's not so scared. then when i put her back in her bin she's less likely to curl up and hide from anything and everything.
i wouldn't offer food too often, as others have said. with your female it's most likely due to breeding season, but i would check temps and stuff as well, just to be certain.