Is it a good sign if she texts you to say she's sorry?

Yesterday, I texted her at around 9:30pm to ask if she wanted to go for a coffee. She answered back at around 11:30 asking if I went to coffee with someone else (I was asleep and didn't hear the ringtone). Later, at about 1:00, she texted me again saying she was sorry she didn't answer back quickly as she was to the movies with some friends (a friend of hers and the boyfriend of the other girl).

She knows that usually I would be awake at 11:30 on a Friday night, so was she scared I was pissed off she didn't answer my text for coffee quickly? We talk to each other a lot, but we don't often see each other for real. I'm interested in her, and I'm sure she at least knows I must be feeling something for her. Would a girl really send a text back at 1:00am saying she's sorry she didn't answer to any guys?

Btw, the 1:00am text woke me up and we texted til 2:00am-2:15am.

Thanks for the answers beforehand!
Is it a good sign if she texts you to say she's sorry?
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