Rellana right side hop mixup

When rellana does her right side hop combo starter, she can follow up with 2 attacks on 1st phase.

There is a fast downward slash followed by a double downward slash: In this combo, if you dodge forward-left the followup double slash will miss, and you can get a charged heavy with many weapons in that window.

But there is also a slower uppercut retreat follow up, that gains a projectile in 2nd phase, which has a different timing to dodge.

If i assume the fast slash is coming, i often get caught in the uppercut, dodging both feels like it has a strict timing that i can't consistently reproduce. I can't dodge the fast slash on reaction.

Is there a way to dodge both while guaranteeing the charged heavy punish, or any way to know which one of the follow ups are coming?