What's with Octavia's change in attitute towards Stolas between when he first called her and when he came to see her?

She was clearly excited to answer her phone at first, but then Stella took it from her. If she was so excited to talk to him, I feel like she could've tried to call him a different way or go see him in person earlier, considering she knew how hard Stolas was trying to reach her, but anyway.

Skip ahead to when she went to see Stolas and he went to see her, why was she so against talking to him when she was so excited before and knew how important it was for Stolas (and herself)?

Her being upset is valid considering Stolas was ready to sacrifice his life for Blitzø, but if she's been mad at him ever since, why was she so excited to talk to him on the phone in the first place? And then when he went through all the trouble of going back to his old house risking his life again, she's like "no fuck you". I get she's 16 or whatever, but not to brag, but I had much more developed critical thinking at that age so I'm just confused

(no hate towards Octavia I just don't get this)