If they ask you again for becoming a ms and you say "yes", they will pressure you to become an elder. Exactly the same happened with me. I didn't want to become ms and elder but I was afraid to say no. For elder I said first no, then they pressured even more and I said yes (you have to know that if you say "no" to the elders it will make them look stupid before the co).
I learned the hard way. JUST SAY NO WHEN THEY ASK YOU. You don't owe them an explanation. Maybe they will wonder if you committed a secret sin that prevents you. Just answer "no" and "don't worry it's not because of a sin. I am fine and if not I will let you know."