Toxicity in low silver is insane

The only way to win in a silver game is to not have a toxic player.
This is because if you don't have a toxic player, the enemy does.
Just last game I had a katarina feed a jax to 12/4/9 and take 1 for 1 trades on an annie worth 100 gold.
In champ select she claimed to be a katarina onetrick and threatened to play katarina jungle or katarina support.
Since she was toxic in champ select i muted her to keep my sanity and it worked out well until around 20 minutes into the game i unmute her.
The entire game she's flaming me and my 9/5 udyr because he "isnt grouping" meanwhile she's inting trying to ult 1v5.
We told her to stop and back up 5 seconds before she went in, but she ignored our pings and inted.
There was nothing i could do about this and she kept inting over and over again, 3 or 4 times and flaming udyr for not grouping while we told her not to fight while udyr was splitting (sucessfully, he got to inhibitor). My draven was 6/2 and we were ahead 4k gold for 10 full minutes before we started teamfighting.

TL:DR katarina "otp" (level 4 mastery) threatens to troll if not in mid and constantly dives turret and flames udyr for not grouping and ints while hes successfully splitpushing