What have I done?

I accidentally created a Sister of Parvos and I don’t feel I was ready for it to happen. All of Venus is covered with a blue haze and the nodes are much higher level than they were before. I don’t quite know what to do, tbh. I didn’t even know a Sister had been created until I saw my money at the end of the mission was stolen by her.

I’m an older gamer so my reflexes aren’t what they used to be. I have a Riven rifle mod but haven’t been able to unveil it as I haven’t been able to do the challenge yet (three head shots in one aim glide). I’ve got quite a few warframes including a few primes, but not a huge array of weapons. I also mostly solo the game so I don’t have a group to help me with this.

Is there a way to get Venus cleared so it’s useable again? I know I’m not going to be able to kill this interloper for a while yet but if I can get Venus clear she can lurk in the Void forever as far as I’m concerned. or at least until I’m strong enough to deal with her.