Girls, a girl I don't know but have a crush on gave me a big smile today when she saw me. Do you think she digs me back?

There's a girl I have a crush on, we ride the same bus together, today she got on, saw me sat there and gave me a big, warm smile. It gave me butterflies. I don't know her name and have never spoken with her, we're just two people who happen to catch the same bus in the mornings, but it's been a few days now. She only recently started getting on and we've ridden it together for several days now, but today was the first time she seemed to acknowledge me. I had a face mask on so she couldn't see my reaction, but I blushed. From what I observed of her she doesn't seem like the overly friend type, I mean she just sits down and puts her headphones on and looks at her phone, keeping to herself as we ride. But her giving me that big smile today got me wondering, maybe she has a crush on me back? I'm wondering what people's thoughts are before I decide if I should try to talk to her in future, say hello and see what happens from there. Or am I probably over-thinking it and best of not purposely trying to engage?
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Saw her this morning again. She was already sat on the bus when I got on, she looked up at me as I passed but then very quickly looked downwards again at her phone. I sat across the aisle, slightly behind her to the left. She spent the journey just looking mostly straight ahead, not sure if she was looking out the corner of her eye or not.

Beautiful, I'm going to try and talk to her next week.
Girls, a girl I don't know but have a crush on gave me a big smile today when she saw me. Do you think she digs me back?
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