Is my coworker flirting or not?

She genuinely smiles whenever I speak.
Today she sat across from me at lunch break and was on her phone but had big grins when I spoke.
She does have social anxiety.
And she kept kept stretching with her hands up and behind her head and her chest out infront of me over and over again. (Chest thrusting)
I told her about what someone at my church said and she started to pull her cross necklace out and show me without speaking or looking at me, then tuck it back in her hoodie.
She is trained on a new position at work that has been making her neck sore telling me she about left early yesterday and that she needs a massage. She mentioned massage at least 2 times.
We are 10 years in age difference she's 18 I'm 28
I know she is 18 bc our workplace requires you to be at least 18 to work here.
She moved up here from nowhere Mississippi and is a laid back country gal. But I can't tell if she is sending signals.
We talk throughout the day with short chats when we see each other and she always smiles. But I think that is her social anxiety in her.
Also she sat very laid back at break from me with one arm over the back of the chair.
She has been here for 4 months and normally goes to her car for breaks but since it's been raining so much she has been inside for break. Today was the first day in a long time she sat at my table.
We have similar interests like fishing and shooting but I've come to find out that she smokes week for her anxiety and I don't want to date anyone that does that. I'm fine with being friends though.
Am I crazy or is she hinting?
Is my coworker flirting or not?
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