The 24-year-old Polish player had to qualify for the Roland Garros main draw and has since produced some upsets.
The 25th-seeded Sjnaider had knocked out world number one Aryna Sabalenka of Belarus in the quarterfinals, but had nothing to lose in the semifinals against the sensation.
It's been almost three weeks since qualifying began and Chwalinska was asked how her body and mind were feeling in the stadium interview.
Not great, I don't want to lie, but it's a Grand Slam, so you just have to give it your all, she said.
In the final, Russia's Mirra Andreeva awaits.
