A girl is shy and reserved, and has someone she likes, but if another person is pursuing her, it may confuse her. Don't let her take the initiative at this time (you still let others come out to see you? Instead, you should take the initiative-take the initiative to walk into the store and chat with her, and you will gradually get a good impression (for example, if things go well, you can say that you are free to have dinner after work? )
Don't be too hasty. Girls are timid in this respect. If you are a little anxious, you will scare her. Tell her with eyes and actions: I mean no harm, just want to talk to you. (It would be better if there were progress)