i think someone at work is in love with me?

hi there is a women at work who is always making sexual inuendos towards me, she is always saying that she is so happy working with me, she will sit next to me and touch my arm and smile and tell me that i am so lovely, at first i thought shes just being over friendly, last week she brought me a packet of fags cause i only had 2 in my bag, she brought me some sandwichs and coffee when we were out (i work with people with learning dissabilitys so we take them out for days she is our bus driver so shes always with my group) we took the group shopping the other day and we were looking round m and s and i saw a dress i liked she wanted to buy it for me i said no and made some excuse about not having it. On saturday my daughter was in the hairdressers where we live and she heard this women asking to put £70 into my account for my birthday present. now i dont know what to do i dont want to upset anyone in case i am reading this wrongly, however i feel that £70 for a birthday present for someone you work with is to much. Im getting quite worried about this now, she knows im happyly married i dont want to tell my husband either. I dont want to report this to management as i dont want to get her in trouble, i dont know how to approach this, any sensable suggestions would be welcomed