I have never heard of a Colombian boa taking that small of a meal...they usually start on hoppers. Anyway, this "throwing up" is called a regurgitation (regurge) in snakes. Stop all feeding for at least a couple weeks to let her digestive track settle down. It sound like you were feeding smaller meals much too often. Make sure her hotspot is around 92, ambient temps 78-80 and humidity above 55%. You may want to try a soak in some room temp to luke warm water, this combined with keeping temps and humidity up will probably resolve a constipation problem...if that is what's going on.
After a couple weeks, try to feed the same size meal you have been. If she keeps it down, wait another two weeks and then try to feed a hopper. If all is well, feed an appropriately sized meal (leaves a small lump) no more than once a week. I always wait at least two weeks between feedings and all my boas are healthy and growing fine. However, if these steps do not fully resolve the problem, a vet check by a qualified herp veterinarian is in order.
Good luck
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