Upvote:3
You're a UK citizen and you intend to apply for a Family visa so that your fiancΓ©e can come to the UK, marry and settle with you in Britain.
It's completely appropriate for you to travel to spend time with her, part of maintaining your relationship, whether before visa application or pending a decision.
As you note, in addition to the relationship, all the eligiblity standards have to be met including income.