Thanks for getting back to me so quick, I think I know why things happened in the way they did.
When I had played the first time I checked and found that bottle fairly quickly but once she popped out I didn't expect her to come kill me right away (thinking it was just a jump scare and calling her bluff by going right up to her lol).
When she got me the game reloaded at the new checkpoint and the acid was still on the shelf, so instead of picking it up what I did was instead go explore everything else waiting to trigger her until I was ready, or so I thought, I assume now that the bottle being clicked created a new save point and dying after that reloaded as if I had already poured it where you are supposed to.
So in my mind I didn't have the acid yet, didn't activate zombie girl, then after completing the electrical puzzle and heading in the direction of the elevator the daughter got triggered, then after dying the second time both girls were out roaming around.
To me it didn't make sense at the time, but it does now. As I thought reloading would bring me before they were triggered.
I never noticed that it came up saying I can sprint now, as I let her just kill me the first time lol. Now that I know that I gotta try again but that makes sense. It's not like I'm far at all, I just wanted to make sure I had a chance, I'm going to restart so I can see it properly.
I tried shift from the beginning, and it didn't work which makes sense after your explanation and I tried using it again when trying to get away from her just out of habit and maybe it did work but I didn't notice because it was dark in the area, either way you answered everything I was curious about. I tried to be somewhat obscure, so I didn't give away anything big. Thank you for the help.