Am i Being Crazy?

Okay, so I am a DIY Bride with no other vendors help besides photographer, DJ, and Hair. My fiancé talked me into getting a day of coordinator, which I fully agreed with because the last thing I want to do is be running around the venue lighting up centerpieces when I should be doing hair and makeup. We booked someone all the way back in May for my November 12 wedding. I gave her my deposit and my final balance was due October 12 (a month before the event). It genuinely slipped my mind because I thought all my balances were due 2 weeks before the wedding. As I was reviewing my notes I realized my mistake and immediately emailed her apologizing for my mistake.
I wanted to make sure that we were still good for the wedding before I sent her the money because I honestly had not had any communication with her since the deposit was given, not even a reminder for the final balance. She didn’t answer my email so I texted her a couple of days later. She finally got back to me and said “Hi Brittney, How are you? You just needed set up and breakdown of the venue right? If so, yes we are still good for the wedding. However I will not be there, and will be sending my partner instead. Please let me know if that works, and if not I will return your deposit”
Am I being crazy for not feeling too comfortable with that? There’s a few things that kind of make me feel iffy about the situation. 1) the fact that I hadn’t heard from her at all for the final balance. Not hearing from her until now makes sense because she is a day of coordinator, so I wouldn’t expect a check in before this month. But I did expect a reminder for the final balance. 2) I’m not too sure about her husband setting up the space, as I was expecting her to come and provide the service since she is the one in the industry. And 3) I don’t appreciate that she waited until I brought it up to tell me she wouldn’t be the one completing the service as previously discussed. I just want to know if this sounds suspicious to anyone else, or if I’m being high strung because of the wedding getting so close