<human>: Summarize the given text in a few sentences.

So my girlfriend and I (both 16, yeah I know, we're young) text each other every day, it's just something we've always done. This morning, I texted  her in response to somethng she said last night (I fell asleep, whoops) but didn't really expect a reply, as we usually start texting towards the late afternoon. I got kinda busy but at around I just texted her saying hi, but didn't get a response at all today - odd, but whatever. She could have lost her phone, or be busy, or anything like that. No worries. Late at night, however, I see a picture of her at her sister's boyfriend's Christmas party (didn't know that was happening)... and she's sitting down, on her phone. Now I know this isn't some big thing to get upset about, but it seems like she could've even at least taken two seconds to say, "Hey, I'm at a party, I'll talk to you later," but instead she just completely ignored my texts. I'm just gonna bring up her not replying tomorrow and see what she says (she better not say she didn't have her phone on her - THEN I'll be pissed), but do I have a right to be upset? I know it's not a big deal or anything, but she just ignored me, when she really didn't have to.
<bot>: GF ignores my text just saying hi all day, even though she has her phone. Is this something to get mad over?