Our 24yo daughter figured out we are in the lifestyle, dinner this sunday is going to be brutal

ok writing this on tuesday evening, the dinner is sunday, ive been awake basically since the conversation happened on monday so any spelling stuff im sorry. me 51, dh 53, in the LS 8 yrs which means it overlapped our daughters teens (we were extremely careful, she was at uni for most of it, our circle never knew her, we played out of town or when she was away). she's 24 now, has her own flat about an hour away, works in publishing, is generally amazing. heres what happened. she has a friend who has a parent in our scene. parent never said our names directly but apparently mentioned recognising "a couple from publishing world" and our daughter joined the dots. she rang me monday after work, voice very tight, asked one direct question. i didnt deny it, i didnt overshare, i said "we should talk about this in person not on the phone, can you come for dinner sunday". she said ok and hung up. that was 36 hrs ago and we havent spoken since. im not embarrassed of who we are. i am terrified of how she's going to look at me on sunday across a table where we used to eat sunday roasts before i would drive her back to halls. there is genuinely no version of this conversation i have a script for. how much do we share, how much do we say is private, how do we acknowledge that she now knows something she absolutely did not need to know about her parents. dh keeps saying "shes an adult she'll handle it" which is technically true but also misses the point that nobody is ready to find out specifics about their parents sex lives at any age. has anyone been through this. has anyone HAD this happen on the kid side. is there a way to handle this that doesnt destroy 24 yrs of trust we've built with her. im not asking for permission to be in the LS, im asking how to be her mother on sunday w/o lying and w/o oversharing.