Upset and a little sad that my coworker crush didn't notice me

I was pushing shopping carts when my coworker crush was about to exit the grocery store and idk if she didn't see me or not I'm guessing she didn't see me but her brother did see Me and didn't say nothing but he looked at me for a 3 4 seconds without looking away I'm not sure if he was gonna give me the shopping cart or not but I doubt it. What upsets me is she doesn't talk to me or Say bye to me like she used to and just act like nothing, since I have social anxiety, low self esteem I'm technically quiet at work I only talk if ask a question about work for example if I can go on my break or if this is damaged exc... some people might say why don't I talk to her and say bye without her saying it back but is it really my fault for not having the confidence to talk to her if I have low self esteem social anxiety?? She's tried so hard for me to try and make me talk more by offering snacks, starting conversation, taking her dog to work and showing it off to me and coworkers, just 2 months ago she stopped suddenly asking me until what time am I at work. She had since October to may that she kept asking me the same question. But I guess she got tired of begging me to talk... there's much more that I could say about this. It just bothers me that now she just acts like if nothing and maybe her brother saw it and that's why he stared at me because when she used to say bye and I'd say it back last year she would sometimes leave with her brother besides her and she would say bye so idk if he sees it too...