It's simply because she rejected him so in her mind the whole things already settled. Like I said she wants things to go back to how they were before they went to the beach, not everyones relationship rather just her bond with Takasu. If you reset that why would you have to act all weird about it?Originally Posted by KrayZ33
Also she didn't avoid him while she thought Taiga liked him since that's the majority of the episodes rather she avoided him after it was said that Taiga liked Kitamura. This in turn means she didn't have to hold back on her feelings which left her confused and unsure what to do hence the avoiding. This is also the second reason why she can act friendly with Takasu again because now she's made a decision which is something she didn't do while she was avoiding him. Since at that point she was just running away from the problem more or less.
One thing that a lot of people think is that she's doing it for Taiga then again that's true and maybe it's just me but that's only part of the reason. In her case being a goofball is a safetyzone and she doesn't have to worry much about the rest. But if Takasu gets closer and closer that safetyzone won't be there. She's not really that good at handling what may come from it and it scares her. Part of that comes from her staying in that safetyzone and not being 100% true to herself, so she's scared that if they become close what happens if they don't like what she really is. She's already said that she's not a good person so her selfesteem isn't exactly at the best and from what's been shown she keeps most friends/teammates etc at a armslength away from her. All in all it's just a big conflict for her and inner turmoil that doesn't show as much.