Sharapova has been the centre of attention in her first tournament since returning from a 15-month doping ban and earlier this week was involved in a war of words with Eugenie Bouchard.
Sharapova picked up a second win in as many days on Thursday, beating fellow Russian Ekaterina Makarova at the tournament. "I'm a competitor - that's when I'm at my best".
"I don't think that's right". There was no looking back after that as the five-time Grand Slam victor, apart from her booming returns, also impressed with her serves as she clinched the match with an ace.
The 23-year-old also took aim at the ATP, saying it had a lot of explaining to do to younger players coming through the system.
"I don't think that's right".
Sharapova will learn on May 16 whether she will receive a wildcard for the French Open, the year's second Grand Slam which she won in 2012 and 2014.
"I understand tournaments want her in the draw", said Mladenovic.
Reaching the Stuttgart final could be enough to move Sharapova's ranking back above 200 and secure her a spot in the qualifying tournament for the French Open and, if she did well in Madrid and Rome, she might make the main draw for Wimbledon.
WTA CEO Steve Simon, speaking to German broadcaster ZDF over the weekend before Bouchard's comments became available, said Sharapova had "served her suspension".
After barely surviving her first-round match against Lucie Safarova, Sharapova didn't drop another set on her way to the final, notching wins against top-seed Agnieszka Radwanska and Sara Errani along the way.
"I didn't back off, I didn't back down and those are kind of the moments that I like putting myself into", said Sharapova, who won this indoor clay event three times from 2012-14. It's a fact that she was caught by anti-doping, but she wasn't the first one.
She clinched the first set after an hour, eventually winning 7-5 6-3.
"I came back and played a really strong game".
"It was definitely great to come out and play matches and being in the quarter-finals here again is quite special". 'I felt pretty good, and I think the adrenaline of just being excited and looking forward to competing and the challenge of every opponent, and the difference of play in each opponent, I'm mentally excited for it.