IMO - I think you should take her in to the vet and have an ultrasound done to see if she is actually gravid. JMO -- but it would be of tremendous benefit to KNOW rather than assume.
If she is gravid that is a tremendous strain on her body -- by feeding her you are taxing her system even more -- if you continue to feed her she could have a hard time passing the food or the eggs. Again you really do need to know if she is in fact gravid - if she's just got a couple weeks left it's not going to hurt her to be off feed for them.
If she has something else going on then you need to know and deal with that as soon as possible.
Just my two cents.