I don't think I understand the first panel. If she was trying to sneak away from Mio and Ritsu, why is she concerned she can't see them anymore?
She was expecting to find them there, she's shy/embarrassed/afraid to be alone at a high school (K-On's were in middle school if I recall correctly) without friends her own age to accompany her. The sneaking part was her just getting to the school without them noticing her as she probably doesn't want to be teased about it.
The Transformation of Yuki Nagato 11Eek!But now I don't see them... I don't know what to do...Hey you creep, lay off with the pushy pickup lines.Mio and Ritsu were acting so strange, I snuck over here on my own...My, aren't you a cute one. Is that uniform from Sakura High? Why don't you and I go get some tea or something?Who are you callin' a creep? Why don't you go tell it to your girlfriend, you snarky bastard?She's not my girlfriend, she's just a friend.