My (30f) girlfriend (30f) “can’t stand” her neighbour ( 26f) but has her around for drinks to be polite

I am new to lesbian relationships so I don’t know what to make of female friends and exs . This woman is someone she was friendly with before her recent trip away where she asked her to dog sit and use the house as she pleases , she was annoyed because apparently she hadn’t stayed and walked the dogs as promised.

She said before they had this agreement she’d come over with her son and he’d sit and play while they hung out and had drinks , she hadn’t told me any of that until the dogs needed care . I worked out that’s why I kept seeing little finger prints on the table and windows .

She now keeps complaining about this woman and says how annoying it is having to see her and she doesn’t want to be rude so she invites her in for drinks .

Lately she had an incident where she was being evicted and my girlfriend genuinely considered taking her in to live with her , with her kid ! For more than 6 months while she got herself somewhere . In her mind she felt bad and wanted to be kind …. But how can you do that with someone who you can’t stand and at one point thought may have stolen something from your house ?

I just know that when exs said they couldn’t stand someone it was always quite the opposite so I’m worrying that she’s had more than friendship with her previously and is now realising she has to move her out of her life . This is entirely my issue based on past experiences

TLDR: worried about my girlfriends relationship with her neighbour