<human>: Hello r/relationships, I hope you can help me. This is the first time I have posted here. Anyway...

I've been dating my girlfriend for a little over 7 months now. And things have been great for the most part. I love her to death.

Anyway, I usually text her throughout the day when we are not together. I tell her when I get to work (she worries because I bike) and other places. Anyway, today is a busy day for me. I'm out from 7AM to 10PM. Today I texted her after I got out of class and got to work around 11AM and 1PM respectively. But while I was at work, a coworker offered me a ride. So I gladly accepted. I didn't think to text my girlfriend because I was having a conversation with said coworker on the way to my next class. I got to class and by 930PM I texted her I was done and waiting for a bus. She texted me back that I was gone for a while and I responded with being sorry about that and that I was busy.

I get back home talk to her over Skype. She sounded a little disappointed and was quiet. (She was also studying)

I mention what I did today and she ask why I didn't text her for over 8 hours. I said that I was busy and I thought it would have been rude to text while I was talking to my coworker that was giving me a ride and that I was in class. She said to not make excuses for something that would only take a few minutes.

I was surprised there was an issue. She knows I have long days. Is she making a big fuss over nothing.

Edit1: thank you guys and gals for the advice. I will text in the morning at the usually time and apologize if I worried her.

Summarize the given text in a few sentences.
<bot>: Girlfriend got annoyed that I didn't text her between work and my class. Is she making an issue of nothing?