My best friend hasn’t replied to my messages since last night. She said she'd take a break from social media, but knowing her, she’s probably reading the messages but choosing not to respond.

My best friend hasn’t replied to my messages since last night. Probably, she forgot her phone somewhere.

My best friend hasn’t replied to my messages since last night. Hence, it’s certain she missed the group meeting this morning.

My best friend hasn’t replied to my messages since last night. I think she might be sleeping.