Unable to invite a certain ghost into my household

I was playing with a pre-existing family from Island Living, the woman becomes a vampire and then dies and becomes a ghost, the relationship with her widowed husband resets. Little harm I think, just restart the relationship and then I can ask her to become part of the family again. The option always remains gray though, despite having both bars (friendship and love) very high.
Above the button it is written that Alika must be in a better friendship relationship with Mele to invite her into the family unit...I don't know what to do...
The family is 4 people plus a dog, I do not use mods in this save and I play from PC...