The 22-year-old defender ended her decade-long stay with Arsenal on Thursday to embark upon a new chapter in her career with Women's Super League rivals Chelsea.
And Flaherty insisted she is relishing the challenge of reversing the fortunes of the side that finished one from bottom in the FAWSL last season.
"I'm a winner and Emma (Hayes) knows that," she told www.skysports.com. "I've not come here to settle and be a six or an eight out of ten.
"I'm here to help the club compete for trophies and win trophies as well as to try and make a name for myself hopefully.
"I think now is my time to make a stand, stamp my authority at the club and get myself settled and make my name as a Chelsea Ladies player.
"Obviously Arsenal are like my family. I was there around 10 years but it's time for a new challenge now. I'm excited by what lies ahead here.
"It's like I'm going out into open waters. I've never had the experience of leaving a team before at this level so it's obviously going to be a new and exciting challenge for me."
Joining Flaherty in moving to Chelsea on Thursday was midfielder Katie Chapman. The pair have both previously worked with Emma Hayes at Arsenal and Flaherty insisted Hayes' presence at her new club was a crucial factor in decision to move to Stamford Bridge.
"It was a really tough decision (to leave Arsenal)," she said. "But as soon as I met up with Emma and the boys and saw the vision that Chelsea had, I just thought it was too good an opportunity to turn down.
"One of the main reasons for me coming to Chelsea was Emma being here and having linked up with her before at Arsenal. She probably knows me better than most people do.
"Emma is very hands-on and knows and understands her players and she knows how to get the best out of them.
"That's obviously one of the major reasons why I've come here. She understands me. She wants the best for me and she's going to push me on further than I could hope for.
"I've not just come here for a season or two seasons," Flaherty added. "Emma's got long-term aims for this club and obviously a long-term vision and I want to be a part of it."