Not taking niece

[Lemonopolis]

I have two DC under 4. My sister's DD is 9, around five years older than my oldest.
Before DC's were born I took my niece out a lot, and often when DC1 was a baby she'd join us on days out too.
Obviously due to covid we haven't had any days out in a long time (when I say days out I mean fulls days to farm parks etc, not just an afternoon swimming etc). I mentioned to Dsis I was taking my kids on a day out this weekend and she said what about niece? Obviously because I had taken her out in the past she expected her to come with us this time too. Tbh I did consider bringing her with us but I decided against it for a few reasons (it's an hour round trip in the opposite direction from where we're going to get her/drop her off, it's expensive enough as it is, not wanting responsibility of another child on a day out etc)
Now I'm left feeling
A. Bad I didn't invite her
B. Like I would either need to invite my niece on any family day out in the future or keep it a secret from my sister when I'm going somewhere.
Was I BU to not invite her?

Definitely say good point. Come with us. Be at XXX at 10am.

Well, your sister is a cheeky bitch isn’t she?

She surely can’t expect you to take your niece on every day out with your children? Aside from anything else the needs of two under 4s are very different to a 9 year old. Also do you even have space in the car? I think her expectations are massively out of the norm.

In future, suggest you all go together. She's being bloody cheeky to expect you to take her child on every trip out.

@Lemonopolis

It was very much said in a way of why is niece not going with you. She takes the kids to stay now and again but only ever one at a time and the furthest she's ever took either of them is a walk to the local swing park.

Do you have your niece for sleepovers?

Next time i would say 'that would be great, its £X for the ticket, she will need lunch and you drop her off and pick her up at X time because obviously i cant do an extra 2 hours travel to pick up and drop her off'.

Your Dsis is a CF

You don't have to check with her when you take your DC out for the day nor factor in your niece. If you wanted to invite niece, you would have done so. You're no longer the single auntie, you're a mum of two young children with your hands full yourself now.

If she was trying to guilt you, then reply "give it a rest Dsis, I'm not your childcare. You can take Dniece out yourself or you and DN could arrange to meet us there (at the place) and all 5 of us make a day of it"

Totally fine not to take her. And next time you so I would be saying that either your sister drops her off at yours or picks her up.