Instant dislike

I wouldn’t stop going Aveline. That would be cutting off your nose to spite your face. As others have suggested, just avoid sitting too close to her, and try to keep an open mind. If you’d prefer not to talk about your family and problems, just avoid doing so and contribute to the general conversation.
Incidentally, what is it about her that you dislike? I must admit to occasionally making snap judgments about new people I’ve met, but given time have really got to like them.

You say a ‘little’ coffee group so does this mean is hard to just sit with other group members and try to chat to established friends?
I understand that this could be hard.
But don’t miss out, as others have said give this new member the benefit of the doubt. One of my best friends, sadly no longer alive, was someone I disliked on sight and took time to warm to, later she confided that she hadn’t liked me either initially. Perhaps this new member is just trying too hard to fit in with an established group.
All the best.

It’s a hard one.
Your gut feeling is probably spot on but why should you give up on something -and some people- you like?
She just may be trying too hard to impress and once she feels more comfortable you may see a nicer side to her.
Alternatively others may feel like you and perhaps she will find it less welcoming and drift away.
Either way, “don’t cut off your nose to spite your face” !
I feel exactly the same about somebody in my book group and just switch off when she is pontificating. Others seem more impressed but who knows, I may not be alone in my opinion and neither might you.

How many are in the group? How did she join?

Agree don't stop going. If you have this feeling about her, I'm sure you won't be the only one.
From experience (more from workplace) the person in question doesn't fit in and leaves.

I tend to trust my gut but, you never know, she may grow on you. I tend to feel a bit of dislike when someone new joins our coffee group, but that's just because I like the group and resist change. It's a me thing. I'd say give her a chance and see what happens. You'll find out in due course. One of the women who joined that I felt resistance to is now a very good friend.

I think I'd not go.
When I've had these instant dislikes, it's turned out to be mutual & some people are stirrers & if they don't like you they'll be causing trouble. (not saying this lady is, but still)
Could you meet up with one or two of the others if there's something on you know they might enjoy?
Or go but keep your head below the parapet by not saying a lot.

I’d keep going……I wouldn’t let anyone’s presence make me feel that I had to withdraw.
Just try to avoid sitting close to her and don’t enter into any personal conversations, there’s lots to chat about without revealing private stuff surely?

Keep with the group and avoid sitting next to her. Just be polite. I trust these instincts, they are given to us for a reason and I’d bet my bottom dollar you are not the only one in the group to sense this. Keep quiet, though, not nice to gossip.

Yes, keep going for a few more sessions, sit near someone else and give this lady a chance?

Sometimes first impressions aren’t always right.

Worry about it all when you’ve got to see a little bit more of her, but don’t leave a coffee morning with people you enjoy and don’t even begin to suggest “getting rid of her”

Good luck