Rec letter

Alright. So, I submitted my app already. I have two recommendation letters. One from my Jr. Year math teacher and one from a class adviser (who I had as teacher 7th grade- and she moved to high school when I graduated from middle school). She was my ASB advisor in 7th and 8th grade and class adviser since 9th grade. So, I have now known her for 6 years and she mentioned that. She now teaches Jr. English (which I have not taken with her) and I am freaking out because I just found out that Barnard requires 2 rec letter from CORE subject teachers that I had 11th and 12th grade. I am sure I can ask my core teacher for letter done by next week. Should I email Barnard?!