I believe that you (or anyone, in fact) should definitely use Passion Panacea as your go-to, or at least as your base spell. The more details are shared with Ashra, the easier for her it is determine which spell (or combination of) would be correct for any given situation. Passion Panacea seems to be a popular one though, and also a highly effective one. I know that in basic situations, such as mine, just that one spell is enough to work on so many different aspects of a relationship. However, the more complicated a situation is, the more detailed and personalised spell(s) must be used.