How to deal with an unwanted guest

I'm having an extremely small wedding, only 6 people will be in attendance. My partner & I are only having our closest friends attend. I'd love to have more people there but due to financial reasons, family dynamics & my partners family being from a different country we have kept our number small.


I was recently spending time with one of my friends that will be attending our wedding. Her mom tagged along for the hangout. She asked me a few questions about the wedding and when she was leaving she said " goodbye, see you in the fall" this caught me off guard because my wedding is in the fall, so I assumed that's what she meant.
I went for dinner with my friend right after & I asked her about it. My wedding is out of town and she said that she would be bringing her mom along. She's not bringing her mom to my wedding ceremony or dinner, but she suggested that she can be there when we get ready to take photos of us. I was caught off guard so I didn't say anything but now I feeling upset about it.
Because my wedding is out of town I planned on spending a few days in the area where we are getting married & then we are moving on to a bigger city. My partner has friends coming from abroad so we were going to do touristy stuff with them. I know that her mom won't be around for the majority of what we do, but I just feel upset that my friend didn't even ask me If this was okay before inviting her. Also the fact that she didn't even tell me, I had to find out this way.
I also don't really want her mom there given that none of our family members will be there & I just wanted the whole thing from start to finish to be friends only.
Am I wrong for feeling this way?