My girlfriend doesn't see my notifications even tho she is on her phone?

My girlfriend is on her phone on Facebook and I tag her in something or she could be on something else but I tag her and she doesn't see it, I had a conversation with her about why she doesn't see my notification and she said because I don't feel like answering it but she responds to my Snapchat message. How she sees it is that she still contacts me as in messages me so she will look at the tag in her own time, I said it makes me happy but she still doesn't see them. We used to tag eachother in a lot of stuff and she didn't have a problem seeing it but now she says if I don't see it remind me that you tagged me in something but even tho she's on the application or she's seen her notifications but doesn't open it? I don't know how to feel about this?

My girlfriend doesn't see my notifications even tho she is on her phone?
Post Opinion