Update!! MIL told everyone about our secret elopement plans 😡

My fiance and I decided to get secretly eloped and have a normal wedding after Covid dies down. It was really important to me that it was private and no one knew. We have talked about it for a while and thought it would be romantic just having our own secret for a while. Unfortunately we found out that City Hall isn't doing the ceremonies right now, and we live in a small town with only one preacher that could marry us, as we aren't part of any churches. The problem is that it's my future MIL's friend, so we asked her to help us set up a date to do the eloping. I told her I didn't want this to be a big deal and I didn't want anyone knowing. My parents weren't even to know. So we set up the date and what does she do? She goes and tells her entire family about our private plans to elope! I'm so mad. I've had problems of her running her mouth about my business before. She announced my pregnancy to her 500 Facebook friends before I could go tell my own mother literally 15 minutes after we told them and were out the door to deliver our news to my mom. I'm almost considering canceling the elopement and planning it another time when City Hall can do it and not telling her because I'm so angry. This was supposed to be our little secret and no big deal since we can't do a normal wedding right now. I'm thinking I should just hold my head up and go through with the elopement, but part of me really just wants to cancel the whole thing now. I'm so hurt and torn on what to do and could really use some advise. Would you ladies cancel or stick with it even though she spoiled it? I don't want to have regrets.

UPDATE

So I texted my future MIL about how I was upset that she told everyone about our plans. I wasn't harsh, but stern in saying that she broke my trust and when I tell someone my business, I don't expect them to go telling everyone else it as well. I said this whole situation has soured my idea of even having the wedding, and if we were to get married, I needed to set my boundaries straight because they weren't being respected. I texted her because I am much better at calmly articulating my thoughts with words than talking in person, and I didn't want to make a scene when I last saw her a few hours prior because we were celebrating a cousin's birthday. So she texts me saying "With the way you're behaving I hope and pray you don't get married. Next time you want to bitch me out be woman enough to say it to my face." I was so shocked and crushed. I didn't think it was called for at all. I panicked, worried she was going to go raise hell with my husband, so I called to try to explain myself. I was crying on the phone I was so upset and I told her i wasn't trying to be mean or rude, but I cannot let someone disrespect my boundaries and wishes for such a huge thing. She said she can't make me happy and her son won't be able to either. My fiance makes me so happy, it's her that is always causing friction. So somehow she guilt trips me into inviting her and her husband to my elopement when I didn't want anyone! I thought I would just appease the beast but now I feel disgusted with her and myself for giving in 😖 I tried to offset this by inviting my parents as well so that she wouldn't get the satisfaction of being the only ones there. I told my fiance that we will do it this way for this time, but when it comes to the real wedding I am doing things our way and will not even mention the wedding until she gets the invitation in the mail. I'm so angry and feel so defeated. At the elopement I am just going to talk to my parents and not even look at her. I will also make sure my parents sign the license as the witnesses and not them because I'm just so sick of her manipulative ways. I just need assurance that I will be able to still enjoy my elopement dispute everything. Please send kind words. I'm really depressed about this 😩