Do NOT do this. Just up the prey size as Kinra and Doolittle suggested and stick to one a week. Every 7 days is perfectly fine and most appropriate for boas. They are not balls and should not be fed like them. Many breeders only feed neonate boas every 10 days right from the start. Once a week is fine. If you want to get rid of the fuzzies, just finish feeding them to her on a 7 day schedule and up the prey size when they're gone. She will be perfectly fine. :gj:
Short answer: NO, your boa is not too thin. ;)