If I invite 1 do I have to invite both? Please read

Just looking for some unbiased input. I’m putting together a small/short girls “trip” (like 1 night stay out of town about 30 minutes with maybe 4 friends) for my birthday. I thought about inviting 1 of my SILs, but then wondered if I would have to invite the other....

Background: SIL A is my husband’s brother’s wife. We have both been in the family about 10 years and are fairly close, she lives in the city we’d be staying in for the “trip”. SIL B is my husband’s sister, we don’t have a bad relationship (did at one time, but has been reconciled) but are not close. My husband has a similar relationship with his sister, not bad, but not close. He’s very close to his brother. Sister lives about 2 1/2 hours from where we’d be going.

I was planning to invite SIL A, but would rather not invite B... thoughts?

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