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Because she likes mujica. Did you really misunderstand Umiri? It's not headcanon, she liked mujica and even told Mortis about it.
The fact that she left without emotion does not mean that she didn't care. Do you know why she even needs 30 bands? For such cases. If some band breaks up, she still has others.
This is her defense mechanism after the first band dumped her and she distanced herself from everyone. She doesn't even have any friends for the same reason, she's afraid of being abandoned.

She chose mujica not because Taki told her about it, she chose mujcia because Taki and Nyamu made her understand that she was pushing them away and pretending like she didn't care about them.
She dropped other band because Mortis said she was being selfish. She wants to rebuild one band, but she afraid to let the others go. Umiri is afraid of drop her defense mechanism.

That's her whole story. She's afraid to trust people again (it's not that no one trusts her, it's that she doesn't trust anyone) and that's why it hurts her so much that people don't trust her when she shows that she trust them now. For example, she tells Nyamu about her story, which even Taki does not know about.

The fact that she became jealous when her band members played with others and then refused to come back proves that she really cares. And yes, she had never liked other band so much.
I think the fact that the members of Distortion were friends and were older than Umiri proves that Umiri does not understand them. She can't be one of them, she just doesn't fit to them.