Williams, who was criticised by the brothers for being treated differently from the rest of the group, said their outburst "sucked" and was shocked when she heard the remarks.
"I don't know if I got a phone call or an e-mail, but I woke up to it, basically, and that sucked, and I was not happy," she told MTV.
"And yeah, it hurts, because what we were told was that they weren't happy, they didn't want to do this, and you can't be mad at someone for not feeling something.
"But then when it really became about all these other things, I was very surprised and kind of felt led on, almost. We've been doing this for six, seven years now. I don't think any of this has been in vain, for any of us ... and I don't think anyone should discredit it."
Guitarist Taylor York added: "It was really hard to read, just because it seemed like a lot of the stuff was pretty irrelevant to what happened. I think that was the weird thing, 'cause it just didn't seem really necessary."
Addressing the band's fans, Williams continued: "But you've just got to know that what's important is the three of us are still here, and that we want to do this, and that's the positive part about this."
Williams recently named the Farro brothers' replacements while they tour South America.