Yknow Selene? She kinda looks like Lucy and she has moon magic which is kinda like celestial magic so maybe shes another of Lucy’s ancestors. Rn, Lucy cant even hold a compare (in strength) with natsu, Gray, or Erza so maybe hopefully Selene (if she’s Lucy’s ancestor) can teach or pass on to dragon slaying magic to Lucy so she can finally defend herself without the help of her friends. It’s kind of a stretch but it would be nice.