Boulter, who had slipped down to 120 in the rankings, will climb back into the top 100 after sealing the fourth WTA title of her career on Saturday in the Czech Republic.
The 29-year-old Briton lost four straight games at the end of the opening set and the start of the second, but she reeled off 12 of the next 15 games to seal her first title since her second Nottingham Open triumph in 2024.
Boulter, due to marry Australia's world No.6 Alex de Minaur this year, said: "It feels incredible. I've waited a long time for this one. I've worked extremely hard after a really tough year and it feels like I got the reward I deserved after putting so much work in.
"I'm absolutely thrilled. I just don't want to stop working. I've got a big year ahead of me. It's my wedding year and that's going to be the best year of my life, no matter what happens."
Boulter teamed up with Maria Sharapova's former coach, American Michael Joyce, at the turn of the year and lost only two sets during the entire tournament this week.
She will climb to No.84 in the rankings after wrapping up her victory in exactly two hours and adds her latest tournament win to previous successes in Nottingham (twice) and San Diego.
Boulter had found tour-level wins hard to come by since Wimbledon last summer and tore an abductor in her final event of last year in Hong Kong.
Fellow English star Emma Raducanu missed the chance to win her first title since her US Open triumph in 2021 after losing in straight sets to home favourite Sorana Cirstea in the Transylvania Open final.
Top seed Raducanu appeared to be feeling the effects of her marathon semi-final win against Ukraine's Oleksandra Oliynykova on Friday, losing out to Cirstea 6-0 6-2 in little over an hour in Cluj.
Romanian Cirstea, 35 and in her final year on the Tour, sealed the fourth WTA title of her 20-year career.
Raducanu, whose father is Romanian, was pushed to the limit in her last-four clash against Oliynykova 24 hours earlier and had no answers against Cirstea's big hitting.
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