The OP says she’s feeling miffed. I think she knows its silly and unproductive but can’t get out of the feeling. Since it happened so quickly it must have come as a bit of a shock, and emotions are funny things which we can’t always control especially when they catch you on the back foot.
In the first instance grandtante has good suggestions which have worked for me in the past, but then, when equilibrium has returned Ireland is a lovely country. Perhaps trying to think of it as a wonderful cheap holiday destination, a sort of second home may help? I hope their new home has a spare room! Do you get on with your DiL’s parents?
How would you rank the last 6 British Prime Minister's



