My baby can be like this, I find he laughs more with everyone else and with me I have to work so hard to get a reaction out of him 😔 I told my husband and he actually reminded me that he doesn’t sleep for anyone else, he doesn’t eat with anyone else like he eats with me, he doesn’t let anyone else change his nappies without a fuss - basically saying we are their safe spaces. I think when you spend so much time around them and do so much for them the excitement with us fizzes so it’s more fun with everyone else 😭 I think sometimes you just have to force yourself to remember that really they feel most comfortable around us and eventually as they become more aware they’ll appreciate it x
My boy is the same. It’s the worst feeling.
Gosh this sounds really tough, but it's not going to be anything you are doing wrong! I don't have any advice or explanation (sorry), but it sounds like you're an amazing mum, remember she's just a baby and her emotions aren't fully developed etc., it's maybe just that she's stimulated/excited by new/less familiar faces and she's very comfortable around you as she is with you so much, so doesn't have the same reaction. Im sure this is easier said than done, as I think I'd feel really sad at this too, but try not to read into it and I'm sure in time as she becomes more vocal and expresses her emotions you will realise you are her absolute world.