Don't sign it. Tell her as the author of the code you'll take 100% ownership if she won't agree to a split. Also, I don't know why you need an NDA as the co-fou

Don't sign it. Tell her as the author of the code you'll take 100% ownership if she won't agree to a split. Also, I don't know why you need an NDA as the co-founder and sole author. Seems like this biz student is on some kind of ego trip. Be cautious working with this person. (IANAL)