Does anyone here have any experience with IFS?

I started seeing a new therapist a few weeks ago and she does IFS. I had a lot of trauma all through my life. I've been through many types of abuse and childhood and as an adult.

This week, some stuff came up from my teenage years and she wanted me to have a dialect with my teenage self and invite her to come stay with me. And I could nurture her. But I feel like that's not processing the emotions from things that I went through back then. I feel like basically I'm supposed to just pretend that I had a different past where I was my own mother and lived my current life, but with teenage me as my own daughter.

I feel like it's invalidating my traumatic experiences that I would like to process.

Last week I was telling her about a lot of experiences I had with difficult people. She said she thinks I don't trust and if you're a hammer that everything is a nail. But I really had these really difficult with all of these people. I guess that felt kind of invalidating too.

She's very nice and I like her. I just find some of this a little confusing. I want to feel my feelings and process them, not make up an alternate reality.

Bonus points if you're a Therapist, who has had experience with this and you can give me some insight.