Girl I see at work likes me?
So for context I work as a FedEx delivery driver and there is this girl at a business I deliver to a couple times a week. Whenever I deliver a package to a business I have to get a signature from an employee. I have been going to this one girl almost every time I need a signature at this business mainly because she has the closest cubicle to the front door so she is often the 1st person I see. The thing is, every single time she signs the scanner pad, she signs it with her initials and then a heart. I didn't notice this at first but later I did, and every time she signs it with a heart at the end.
However I don't have very many other clues that would tell me she is into me, she is just polite , no maintaining eye contact for a long period of time, or big smiles or trying to talk to me beyond"hi" ""you too" when I tell her to have a nice day, now I probably come across as quiet and standoffish because I always try to maintain professionalism with anyone I talk to at any business unless they end up talking to me about something and opening the conversation, mostly because being a driver for FedEx I'm ALWAYS busy and in a hurry so I don't often have the time to just chat with everyone since I have 70-120 other places to deliver to that day. So I know I probably haven't necessarily made it easy for her to show other signs of her being interested in me.
So I'm just torn on if she is into me at all just based on the heart thing or if it's just something she always does whenever she writes her signature on everything. I have thought about just straight up asking her why she writes the heart on it, but I also don't want to be too "direct" and make her feel uncomfortable or caught off guard, because maybe she is into me but asking her just straight up why she writes the heart might scare her or something like that, idk. What do you guys think I should do?