I just text her that she had gotten prettier and she seems comfortable texting me like the last time?

I texted her just now and something changed. The last time I texted her, she answered quite short so I'm guessing she's bored of texting me but before that, she answered long and fast. Even if I stopped texting her for like a week, she would still answer short and reply long. I don't know if she's upset or bored but just now, I texted her through whatsapp and I told her that she looks prettier in her new picture on whatsapp. She then feels comfortable like she used too when she texts me. I was wondering what if I don't text her that and just text her like hi and everything, it would be the same, answering short. It's just weird that I just texted her that she's prettier and she suddenly became comfortable texting me? It's weird.