That all seems like way overkill. Honestly, if they give her back quick-scoping that might be enough tbh. You can make venom mine a bit better, lower hook CD by like 2s. I'd be scared to do that though, if you give her an inch she gets a whole lot back.
Maybe all at once is too much, but only because literally every ability she has other than the sniper itself woefully underpowered, with the sniper being only slightly.
I especially think she needs a fast grapple. 10 seconds is almost as worthless as 12. I think it should be 6 at most. Other heroes have SO much more mobility that it's baffling. I'm not evne talking about designed to be fast characters like Tracer, but D.Va can fucking fly every 5 seconds, Soldier can sprint infinitely at any time, Hanzo's wallclimb is passive, Junkrat can use his mine every 8 seconds...It makes no sense to me why Widow's CD should be anywhere near the double digits.
I also think she needs an ult with some offensive capability. Wallhacks can be situationally useful, but the sucky thing about that is that you only know the situation after you activate it. You could activate it with no one near enough for it to matter, or have the team already know where enemies are. Plus, it really is lame that Hanzo has her ult as his ability. So it needs something.
I'd be fine with just those two buffs if that's all I could get.