My MOH Dropped Out, I Don't Know What to Do

You dont *need* an MOH. Just leave everything as it is. The only important role my MOH did for
Me on my wedding day was hold my bouquet during our ceremony…and literally anyone can do that, even a seated guest if you have no bridal party at all

Bridal parties aren't a necessity. so you could always choose to not have a bridal party at all. Or just stick with your sister in law

It sounds like you just need to stick with whoever is left, and just leave it at that. Wedding parties are not necessary (or even important)parts of a wedding. The only people that should be standing with you on your wedding day are your nearest and dearest. Never asked somebody to be a WP member simply to “fill spots”. Remember, these people will forever be in your wedding photographs. You don’t want to look back at them and see someone who isnt close to you or is not even in your life anymore.

I agree! You don't need to have a MOH (or any wedding party at all!) I'd stick with who you have and think it would just cause more stress trying to add someone new as MOH!!