So asked this girl out once she said no A Lot has changed and i have a feeling i might have a chance. help!?

ok so last school year I was probably about 25 pounds heavier then i am now. I asked this girl out and she basically said no. over summer i lost roughly 25 pounds and we have still been talking. She was the first person to notice i was losing weight and said your really looking great. we hang out with 2 other people quite frequently and I catch her eying me sometime while were eating. when i look at her she nervously looks away. she seems to be a lot more flirty with me then she used to. every time i see her in the hallway she puts a mile wide smile on her face. we are talking a lot more and about more serious stuff. just this week she stayed at her friends house and i texted her through her friends phone, (cause she got texting disabled) anyways, then the next day i get a chain tex from her friend saying something like don't give up on the one you care about most of all. the one you can't go a day without thinking about. send this to 10 ppl...... and i'm like whats that about? her friend said er idk um idk. so i'm trying to figure out, is this a coincidence? or is she trying to tell me something? and I'm not done losing weight, but when i am i would like to ask her out again. I just don't know do woman change their minds easily about guys? i want a womans honest opinion. is it worth trying for? or should i just move one?