My class teacher was not happy with my mistake of using a wrong title

I am attending a cooking course on weekends. Since I could not find the timetable for the classes in April, I emailed to one of the teacher assistants, XXX. I wrote Dear Title surname in the salutation. Here are the extracts from the emails:

Dear Ms XXX,

I could not find the timetable for the classes in April. Please help.

Sincerely yours,

Kitty

In her reply to my first email, she said:

Please pay attention to my contact information! I have attached the...

After checking her reply email, I said:

Dear Ms XXX,

It is well-received. Thank you!

A few hours later, she emailed to me and said something exactly like this

...if you are careful enough you should be able to find that it is Miss not Ms. I believe that you do it on purpose just to show your disrespect...

She is a TA, and she looks like in her late thirties. But the contact information on the school's web does not tell whether she is married or unmarried, so I wrote "Ms surname" instead of "Miss surname". I have sent a few emails to her to apologize for my mistake but I do not receive any replies from her. I will attend the cooking class this Saturday and surely will meet her in the class.

What shall I do now?