(NOTE:THIS IS JUST A THEORY, IS NOT CONFIRMED)

Think about it, first she manipulates John Walker to become U.S Agent in “Falcon and the Winter Soldier”, then she made believe Yelena Belova that Hawkeye killed Natasha Romanoff in “Black Widow”.

Now, she might take advantage of Peter’s framing as an opportunity to “recruit” him.

Imagine…

Val shows up at the police station where Peter is been interrogated.She tells Pete that she believes him, but the people outside won’t, unless he takes the first step. Val tells Peter that she has the sources for him to clean his name. At first, Peter’s not sure about the idea, so he tells Val that he’ll think about it. In that case, Val leaves Peter her number to call her when he made his choice.

At the end of the movie, when Spider-Man and Doctor Strange had fixed reality, everything goes to normal. Peter decides to call Valentina and meets her in a place at Long Island. Peter accepts her deal, with the condition that she provides security for those close to him.

But, at a post-credits scene, Peter goes home to tell his Aunt May about the deal he made, only to find Bucky Barnes/Winter Soldier in the apartment. He warns Peter about Valentina’s true intentions.

(NOTE:THIS IS JUST A THEORY, IS NOT CONFIRMED)

Valentina’s employer is actually Thunderbolt Ross and/or Norman Osborn and that he’s recruiting the Masters Of Evil to make sure the Avengers are not re-assembled again.