I’m Second Guessing My Wedding Planner

I feel like I never should’ve got a wedding planner, I am already down thousands of dollars and to top it off lately she's been forgetting details we've already discussed.

She’s been asking questions I've answered before. Mixing up vendor names. Nothing major. Just enough little things that I'm starting to notice. The problem is we're 4 months away from the wedding and now I don't know whether I'm being overly anxious or whether I should be concerned.