There's no way they helped considering she easily won a majority of pledged delegates. The fact that they exist as a mechanism to protect the establishment and that they overwhelmingly backed Clinton could totally be used against Clinton.
Have you ever heard of the "bandwagon effect?"
The bandwagon effect was never really present in the D primary. Even after each candidate got yuge wins, they got little to no "momentum" out of them. Considering that, I highly doubt any people were switching their votes based off a number on CNN or the AP's website.
There was a bandwagon effect, but it happened early on, and it was more about who people's Facebook friends were supporting than who was actually winning contests.