Lilacs By the Sea by Kay Correll

Francine Winters—Frankie to her family and friends—doesn’t know how she got to this point in her life. Her marriage is falling apart. Will moved into the guest bedroom and their marriage is crumbling.
They’re considering a trial separation but haven’t told their grown daughters yet.
Which is too bad because…
The last thing she needs is the surprise family vacation the girls plan.

And to make things worse? They planned it at the very place she and Will had honeymooned. A celebration for their fortieth anniversary.

Frankie is sure she can make it through this. It’s only one week, right? Then they’ll tell their daughters the truth.
But a lot can happen when you come to stay at Blue Heron Cottages…