The opener blasted 79 off 40 balls in a 47-run loss to Australia in Brisbane's series decider on Thursday night, having already mustered an unbeaten 99 off 74 and 132 from 64 on Sunday and Monday.
She became the first player to score more than 300 runs across three women's Twenty20 games as West Indies fell just short of a first series win against the world champions.
"I don't think so," the 25-year-old said when asked if she'd ever been in better form.
"Being able to notch up 300 runs in a three-game T20 series is something unbelievable.
"I set targets coming down here and I can tell you it definitely wasn't getting 300 runs in three T20s."
The sides begin a three-game ODI series in Brisbane on Sunday with Matthews hopeful a quadriceps niggle won't keep her from leading an improving team who, she knows, rely on her deeply.
The captain said she felt some tightness in Monday's second game. She was troubled by it again on Thursday and will have scans to determine the severity of the injury.
"So maybe a little strain there but we're going to assess it when I cool down, and have a better picture of what's going on," she said.
"Hopefully it's nothing too serious and I'm all ready to go in the first game for the ODI series."
Matthews was playing for the Barbados senior women's team as a 12-year-old, debuted for her country at 16 and powered the successful chase against Australia to win a Twenty20 World Cup when she was 18.
Matthews' wicket on Thursday at Allan Border Field triggered a collapse of 5-7, West Indies falling from 0-97 to be all out for 143.
"I know that I have a big impact on the way that the game goes," she said.
In 27 T20 innings as captain Matthews averages 40, compared to an average of 18 in 61 innings without the responsibility.
"Sometimes, it can be stressful, but as a leader they're things you have to put on your shoulders," she said.
"And in the second game I couldn't win that game without what Stafanie (Taylor) did (scoring 59 off 41).
"How I've been batting here is just trying to play really, really good cricket shots and that's my exact plan going into the 50-over series as well.
"If I get fluent I'll be happy with that, but there's definitely a lot less pressure to score quickly."
West Indies' women have won once in 15 ODI meetings against Australia, Matthews confident her inexperienced middle order will fare better with less pressure to score quickly in the longer format.
