Of all of my snakes, only one has regurgitated during shed. He has done it a few times, and it's very difficult to notice if he's in shed near the ladder portion, so I have to be extra vigilant. The good thing about this type of situation, at least from my experience, is that the regurgitating hasn't continued, and he eats and digests perfectly when not in shed. You just have to be particularly observant during these times, and make sure she isn't in shed during feeding.
Some of my snakes just refuse their meals while in blue, but some eat with perfectly normal digestion. Only the one has regurgitated, and most likely will continue to do so, which just means he has to be more carefully monitored, in order to avoid feeding him in blue.
Not to say that this is the case, and I would treat it as a worst case scenario just to be safe, offer smaller less frequent meals, and return to normal feeding. I just thought I would share my experience with a similar situation, and hopefully this brings some reassurance.