She's mad because she had everything at home working fine before leaving to Barca and when she arrived back she found some things screwed up and not working and had to replace them with her own money. And people didn't even tell her anything, nor an appology or even a thank you for her patience. And I almost certainly think one of the people she's mainly mad at is Babi herself, because in the end she was left as the owner of the apt. She (Babi) even messed up with the washing machine (which she still managed to put back in place or replace without the cabinets door). They all did wrong, Babi and some the people she hosted, one more time abusing of Masha's kindness...