Is my stepmother flirting with me?

Ever since I came home from college.. my step mother has been really messing with me.. She is always staring at me, always joking with me, and one time when I took her to the store, a guy asked if I was her boyfriend she quickly said yes. When she takes a shower she always walks around the house with only a towel wrapped around her. And then when I take a shower she just barges in and ask if I need a towel or she needs to use the bathroom when we have 3 bathrooms in the house. Am I correct to assume that she's hitting on me?
Is my stepmother flirting with me?
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