Old lady was flirting with me!!!!!!!!!!?

WTF! Right a few hours ago, i was walking to my mates! And there was this oldlady outside her house. She ordered a new washing machine, but the delivery guy just left it on her doorstep and she couldnt take it in. So she asked me for some help. sooo i took it inside her house for her. And then shhe was flirting.. kinda! She kept touching my arm and stroking it and saying stuff like 'your my knight in shining armour'. Then when i sat down and she was next to me she had her hand on my leg 0_0 . seriously it was creepy! Im only 17 :( what should i do? shall i tell someone? was she just being.. nice? shall i avoid her?