Horrible matches? I would not say that. She made two good and two bad matches. Anyway she prove herself the last season and it would be idiot if you let her go. She can change the balace and play good in important matches.
About Lorenee.... I do not know what to say if Rosamaria is horrible what word fits to Lorenne...
Yes, she had a terrible match against Turkey and the rest was just not enough for an OPP, she did ok against Italy, was bad against Canada and against Thailand she was suffering to score. The only game she played good was against Germany.
The thing is, she had space to succeed or fail, Lorenne didn't, it was the same for Naiane, Lorena, Laís, even if the starters were playing (really) bad.
As an OPP, I don't think Rosa is our best shoot, I could take her instead of Tainara or Pri Daroit, but we need more options for opposite, and I think Lorrayna still too green.
You can see Lorenne as an horrible player, who shouldn't be in NT anymore, but I don't think one set, her first one in competition, can define her job.