To answer the original question that you wanted to type in but couldn't

, NO, I don't think you're doing her a disservice by continuing to bf her. I don't have any experience with working and bf'ing, only with bf'ing my two girls, and they have been very different in terms of their 'attachment' to me. My dd2 is soooo much more 'attached' to me than dd1 was. When I say this I mean in terms of being happy to be away from me. At the moment dd2 (similar age to your dd - lovely name by the way

) is just sooo 'clingy' it can be a bit of a pain (like when I want to put her down!) so I can't imagine having to put her in someone else's care. Dd1 was not like this (or to this extreme), and their situations have been very similar (apart from the having-a-sibling part). I bf dd1 until 25m. So I don't believe that how she is 'behaving' is to do with bf'ing. I think the re-adjustment to being back with the carer after a few weeks was bound to be difficult (and she possibly started with more separation anxiety during that time coincidentally anyway). Also my dd2 has had a really weird month in terms of her napping and overall schedule, so possibly a yucky stage at the moment too.
If you were to stop bf'ing, how would she take her formula?
Anyway, just a few more thoughts for you. Hope things work out for you, and you come to a new routine that works for you both.