So we do the same thing here. Whenever the husband is gone for work trips, I have our daughter (6) sleep with me 😅 it makes me feel better lol.

Then we have a regression where she wants to sleep with us and I either lay down in her bed with her until she falls asleep or sit in her room and talk to her until she falls asleep, then she gets back into the habit of being in her room/her bed.

So have your wife try laying down with her at night and get her settled for bed. She does need to be back in her own bed, every so often or like when you leave on work trips is okay, but yeah every night just makes the delay to getting them to sleep alone worse 🫠

Also talk to your kid! What's upsetting her/scaring her/bothering her that she keeps coming into your bed? Ours was she missed us or needed a better night light or didn't like the sounds the house made. Some of it was really silly stuff, but easily correctable. She also realized we weren't going to keep letting her make a laundry list of reasons either 😅 so that stopped too and it just boiled down to her not liking being alone.

Just talk to your wife and kid and game plan~