Difficult to tell, but if she's being rejected by 3 colonies in a row and that she's not the most active, I'd have her checked by a vet to make sure she is healthy, because sickness is often a reason for rejection.
That being said, she might just be afraid and depressed, which is why she's not active.
The way she eats mealworms is not necessarily an issue, of all my fliers, not all eat the same way, some chomp,, others eat them bit by bit, some masticate others dont...