Mine does seem to shed quite often too, definitely more frequently than the boa. It seems she's shedding every couple of weeks or so - I think she's in the middle of it right now, as she's hiding and didn't even come out to eat. I checked on her and she's fine, but that's what she does when she's ready for a shed.

Being only 1.5 years old or so, I'm guessing she sheds so much because she's still growing (she's only about three feet right now), but I thought that as they got older, the shedding frequency decreased.