To ask my SIL to not visit after 6:30 pm on a Sunday evening?

Thank you all so far. Why don't I just say its not convenient? Or invite her at a convenient time. Because then Im afraid she would never visit. She's not really comfortable with the kids and not close to my dH. Any time I have ever asked her for a specific time she is too busy. Its on her terms or none. (She makes a huge fuss about being DD1's godmother... this year once again said she would take her out for a day instead of a present.... last year she finally did it about 4 months later, this year she still hasn't done it (7mths on).

My family are all far away - we visit 4-5 times a year if I can. But my DC don't have many relations so I really don't want to annoy her and stop the visits altogether.

SIL is about 4 years younger than us, doesn't have a partner or children. Has a very busy job with lots of out of hours calls, emails etc. She has friends and sometimes sees them or goes hiking on weekends. She lives about 15 mins drive away and we rarely see her. My 3 children are her only nieces/nephews. She doesn't allow us to visit her house (yes, literally says no..... once my son, 7, wanted to use the toilet and she was giving my son and DH a lift home she said no, he couldn't go in, just drove them home. )
Anyway she does her weekly shop in a place near us and every month or so will arrive around 7pm to visit. If I ask if she had a busy day.... no, just some WFH, etc. We just aren't enough to visit without adding us onto her shopping. My kids are older now but they have sports fixtures on Sundats so need showers before bed. And I try to have some downtime, watch a family show together etc, then do stories. So I find the random 7pm visits annoying. She just messaged to say she would call later, when I queried time - yes.. Around 7.
She organised a meal out for PIL, BIL, herself and my DH and I a month ago and it was on a Sunday at 5pm. Why can't she call here at 5pm?
YABU. Suck it up.
YANBU say something.

Some people are thoughtless idiots. I get this often too and the annoying thing is even saying it's too late straight out, they just think you're sitting there with nothing to do. I wish people had a bit more cop on and had some consideration for other people's lives.

Then we would never see her. I feel my DC would lose out having no relationship with their aunt, as my family are all a long distance away.
That said they probably see more of my brother in Texas and are closer to him.

Surely this is your husbands issue to deal with not yours. Tell your husband you don’t want visitors that late and that he needs to talk to her. If he won’t then you just make yourself unavailable whenever she comes. Go off and have a bath, say you’re going out to meet friends.

As for her not wanting people in her house, that could be for a whole host of reasons. She could be a secret hoarder, she could have severe OCD or she could just plain and simple not want kids in her home. Either way it hasn’t really got anything to do with the issue at hand.

Why wouldn’t you (or DH for that matter) just open your mouth and say, 7pm doesn’t work for us!

Just explain that'd not suitable for you and the family, but you'd love to still see her. When else is she free?

She isnt close to my Dh. He isnt great for keeping up relationships with his family. But my ILs are the only extended family my DC have that arent 5 hours away, and I'd like them to know their aunt.

I don't really understand how she's combining this with a shopping trip as virtually everywhere closes at 4 or 5pm on a Sunday.

'Sorry, that's too late tonight as we're getting ready for the week. We'll see you soon'

Then, if she still shows up - which is quite likely - you can turn her away at the doorstep because she's been warned.

Can she not just sit and watch the show with you, chat a bit, maybe read them their stories and then disappear before bedtime?

She has no issue telling you, you or DC aren't welcome in her home. Just tell her this isn't a good time to visit. Where does she shop on a Sunday that's open until nearly 7pm anyway?

Hello.
You are all right - I need to put on my big girl pants and deal with this. Tonight wasn't the night though, it is my sons birthday tomorrow and my PIL usually come for a little tea party for birthdays, but they are away so I was facilitating this so he didn't feel forgotten (he has SEN).
I just cleaned up the kitchen when I got back and even hoovered the floor, and she had to talk to DH. They get on OK, just don't make much effort.
My SIL was quite chatty tonight; she is well meaning but a bit clueless, so i have decided to proactively invite her over for a barbecue some Sunday afternoon in the next month. And then to lunch another day. And hopefully say then about the Sunday nights.
Thanks all. You have helped me "cop onto myself" as we say here or "give my head a wobble" as you say in UK.