There's a 3some with Victoria? Damn I had never experienced the feeling of saltiness for "missing a mere side quest" in my entire gaming life but this may be the 1st lol.
If there's a mandatory event like the daughter's outfit get damaged then it indeed can't be solo, but what i meant by solo is the MC can easily handle 5 opponents no problems at a relatively high level, highest damage weapon, highest def armors, a strength & damage reduction potion. Not to mention, your daughter's level at that point is wayyy lower than yours so chances are she'll get oneshot'd & leave you to solo all 5 of them anyways.