Visiting during respite care

[Morenicecardigans]

FIL has mixed dementia and is going into a care home for respite care for two weeks on Monday. We'll be staying nearby for next week (after cancelling our actual holiday) and I'm a bit concerned about how much time MIL thinks she'll spend visiting.
Obviously we'll take her if she wants to visit but we are only in this situation because MIL is tired, stressed, not eating, depressed and confused. She needs to use this time to actually have a break and I'm worried FIL will find it difficult if MIL is there in a completely different environment. Has anyone got any experience of this.

I’ve seen lots of respite people appear in DM’s various care homes.
Your first job is to reinforce who needs the respite.
So as it’s MIL who needs the respite then DH tells her FIL is having a fun time with a trained support team, so she’s free to do some lovely things with you and DH, all guilt free.
Then you let her do restful things away from care home.
FIL is unlikely to be having quite as jolly a time painted by you, but don’t go down that road …

I’d be inclined to tell all the white lies I thought I could get away with. Like “visits allowed only between 11 and 12 in the morning” or “they’re locked down today because someone has a stomach upset”

I think they both need the respite. FIL needs to be fed regularly and MIL needs to not be "on edge" all the time. We are also trying again with carers after MIL cancelled them a few months ago and saying they are coming in especially just to look after her for these two weeks. Then she is used to them by the time FIL comes home.

We did think we could try and do some nice things with MIL while she is on her own but she doesn't like doing much (this is not a new thing!). White lies seem to be the way to go as I don't want her to waste the whole time stressing about visiting FIL.