The group was dogged by rumours of in-fighting and jealousy towards frontwoman Scherzinger, and Wyatt quit the line-up in early 2010.
Scherzinger left the band later that year to pursue her solo career, and Wyatt claims she has since attempted to patch up their relationship but to no avail.
She tells Britain's Daily Mirror, "I have not spoken to or seen Nicole in quite some time... and that's not through lack of trying. I've made enough first moves now, I feel the ball is in her court.
"I just hope that Nicole is actually happy as a person. Our dealings together weren't always easy - it wasn't an easy situation to be in, in the Pussycat Dolls, period. But I have a lot of love for Nicole and if she offered (an olive branch) I would accept it with open arms.
"I have a lot of understanding but, at the same time, I wish we could get past that and just move on. I mean, jeez, let's grow up and enjoy our lives."