I dont know if im in love or not?!?

Ok I'm going to make it quick. A girl came to live with me from a state far away. She has a child, a baby girl. She lived with me for about 2 months and we became the best of friends. We know everything about eachother. Her daughter stayed with her mother in that far away state. She told me her mom wants her to go back and I'm all for it she needs to be with her daughter. I was hoping she would bring her daughter to live with us. I really care about this girl. This is honestly the first girl I could see in my future. I haven't even thought about kids but id be willing to take care of her and babygirl and that's a lil scary to me! And we fooled around only once on a drunken night. Here's the catch: I think I'm in love with her and she left... and I have told her absolutley nothing regarding how I feel about her. I think I made a mistake and I should of told her and now she's gone and I feel its too late aand I don't wanna tell her and her not feel the same way but her sister said I should've told her. Should I go after her or should I just get over it?