Erocse-
Growing up in a small community I understand where you are coming from. I have quite a few close family members that are gay (including my sister), and I was heckled in high school because people knew that. However, if kids weren't making fun of me for that it would have been something else. Being a teenager isn't easy, and kids aren't nice. However, as Kendall said, don't underestimate the strength of your daughter. If she is anywhere near as intelligent and compassionate as you and Mrs. Erocse are she should be fine.
I also agree with Jenny, as a young adult you must learn to differentiate between friends and fair-weather acquaintances. If someone is willing to put her down or try to make her feel inferior because she loves her family, or because she isn't conforming to their norms, they aren't the kinds of friends she is going to want or need in her life. If my "friends" don't accept my choices or the choices of someone I am close to, I don't care. However, if they can't respect them then that is their issue and I don't need their negativity in my life.
If anything sit down and talk to her. The same as it is important for you to communicate with your partner it is also important that you keep the lines open for her. It seems like you are doing a great job with that! If you feel that you can't go full time because of the effects it may or may not have on her then that is your choice. If you need to compromise, do it in a way that you can both be happy. Otherwise, give it a shot. If she supports you, and you feel that she is being as honest with you as you are being with her go for it!

In a way your confidence in going FT, and the happiness she will see in you, may cause her to hold her head a little higher and show her how to be proud of who you are. On top of that she is witnessing the unconditional love that you and Mrs. Erocse have- one of the best examples that you could give her as your child.
I know that my suggestions, and the suggestions of others here may not be your final choice. Just so you know though (strictly speaking as a nearly 21 year old girl who is still trying to find my own way) if I was your daughter I would be proud of you. You are doing nothing wrong by choosing to go FT when you are ready. You and Mrs. Erocse are not neglecting your children, nor or you denying them the love they deserve. Whatever you choose, your heart is in the right place, and I am sure that your daughter will understand that.
*Hugs*
Best wishes, Erocse. And do let us know how that goes?