If Clinton won by doing slightly better than she did IRL, that means the Senate is at least tied (+McGinty and Feingold) or potentially 51-49 (+Kander) or 52-48 (+Ross). I'm pretty sure that would mean Clinton is focusing mostly on filling judicial appointments and foreign policy.
Actually, not really. Toomey and Johnson ran ahead of Trump on their respective states. So assuming an even swing and no ticket splitting, Toomey would still win by like half a point and Johnson by over 2.5 points.
So the senate would stay where it is now.
Senate runs are often more reactive than Presidencies, and it should be noted that Wisconsin, Pennsylvania, and North Carolina are polarized like heck. If Hillary had won those, I have no doubt the Democrats would've run ahead of her, not behind just because of the Berniecrat enthusiasm...it was those 18-21 year olds who gave it back to Johnson after all.