Its all developmental based and is completely NORMAL.
She is not a people "hater" she's just a baby... and at this age... their short term/long term memory is not like ours.
They don't even have "people skills" yet, nor the analytical ability to cope in social situations. AND they are attached to their Mommy. NO problem. Most people who have kids WILL understand that.
My daughter, didn't "like" her uncle when she was a baby and toddler... because his hair was 'scary' to her... it was a big thick gray and white head of hair and unruly like Einstein's... when she got older, she told us his hair scared her. No biggie. They are just kids. It makes sense to them, but not us. All part of growing up.
Also, for some babies, even smells and "vibes" and colors can set them off. They also sometimes don't like when people come too close or put their faces RIGHT in front of theirs... it's too close and uncomfortable for them.
A baby... goes by instinct and survival modes too... so, anything too close for comfort, or loud voices or people getting too close, can set them off. My daughter as a baby was also "noise sensitive" & sensory sensitive...ANY loud noises or large groups of people un-nerved her and she would scream! Its fine. That is the way she was... we can't force her to like big crowds or noises. Each baby is different. My daughter hated when someone familiar or stranger, would go right up to her and look at her in the face closely and coo "oh how cute...what's your name? How old are you? " I mean gee, a baby can't answer those questions and to have a person put their face inches away from your face, (even for me) is a bit irritating. People tend to do that to babies for some reason.
So, I would just tell people my child does not like CLOSE abrupt "in your face" type interactions yet... she is JUST a baby and she is having 'stranger anxiety.' No need to apologize.
The thing is, go according to your baby... they all have their own temperament and development. It is better to have a baby/child that is like this, than a baby who has NO 'fear' of strangers... because then they will just to go ANYONE willingly.
I was told by my Son's Speech Therapist (who is also a Child Development Assessor) that THIS kind of 'behavior' is actually a "MILESTONE" in a baby... and its a good thing. She said, that she would actually be worried if a baby did 'not' react that way... because then it would indicate a developmental issue/problem. A baby even this young, is having a sense of themselves and instinctively KNOWS who their "mommy" is and primary caretakers... it also shows 'bonding' appropriately. SO, your daughter is normal and behaving appropriately per this developmental "milestone."
Its all about ages & stages and developmental phases. Lots more will come up.
All the best, your girl is fine... do NOT feel 'horrible' because your baby is uncomfortable around others. NO NEED TO APOLOGIZE or make excuses for her. She is just a normal baby developing well.
Good luck,
Susan