there is no need to jump to any conclusions on behaviour when you're not around, babies pick and choose who they bond with. my two (aged 3 and 1) have always blown hot and cold with daddy and with our second helper (who is energetic, caring and attentive to them, but doesn't do any night duties).
like peainpod, you have to decide what you want and whether this lady meets those expectations. hard to say from just a few posts but I'm guessing she doesn't. there are lot of great helpers there and you sholdn't feel tied to who you have just because you might get someone worse (not that anyone can guarantee that won't happen unfortunately). it seems you treat her well and respect her with her time, space and workload so are totally delivering your side of the deal...
like peainpod, you have to decide what you want and whether this lady meets those expectations. hard to say from just a few posts but I'm guessing she doesn't. there are lot of great helpers there and you sholdn't feel tied to who you have just because you might get someone worse (not that anyone can guarantee that won't happen unfortunately). it seems you treat her well and respect her with her time, space and workload so are totally delivering your side of the deal...