My mom's friend likes me!!

I am an 18 years old male. I live with my brother, father, and mother. My mom is 38 years old and we have a great relationship in which we can talk to each other about anything. My mom has this friend that is 35 years old who works with her. She is divorced and lives near our house. For some reason she comes to house very often. What bothers me is that she always hugs really tightly and holds it for around 10 seconds. This is normal because we're really good "friends." The problem is that I get an erection when she hugs me which is really awkward. I try to stay away from touching her but it's hard. She's 5'9 with a thick body. She has light brown skin and long dark hair. She always wears normal clothes meaning she doesn't wear shot shorts or anything like that. However, she does wear REALLY loose tops. Whenever she bends down, her tits show completely which is really awkward. She has a tight ass because I've been to a beach with her where I saw her in a bikini. She always comes and sits beside me really closely. She thinks that Im her friend even though Im not. She's always bending over whenever Im around. I don't know if this is just me thinking wrong or if she's giving me signals. I try my hardest to not get hard around her but she always does something like "accidentally" show her tits or rub her ass against my dick while she is walking by. WHAT SHOULD I DO? WOULD THIS BE CONSIDERED SEDUCTION OR DOES SHE JUST HAVE A "SLUTTY" PERSONALITY?