[TOMT] Title of a time traveling romance book from the 80s/90s

I had read a book a couple of years ago, I believe it is from Debbie Macomber, but I’m not sure. It started with the Female Lead (FL) on a trip in England with her boyfriend/fiance (??) with his spoiled 10 yr old daughter. I believe they had an argument and so either she walked off or was left behind by them in a cemetery and she started crying on top of a random grave. She began hearing a voice calling out if she needed help, but it sounded distant. She somehow ends up transported across time in Medieval England and meets the Male Lead (ML). They spend a few weeks together and she’s trying to figure out what happened. Somehow, they both get pulled back into the present and the ML has to adjust to be in the present day. He ends up getting transported back to his time and the FL breaks it off with her partner. I don’t remember the ending, but I’ve been searching for the book again for years (╥_╥)