I have/using HaP ac 2. one device is living room, and one device has my room

This Image is my home & located HaP ac 2. red dot has located and black is Concrate wall.

Problem is My Daughter's room has very confusion. and not fixing to this - if right thing is missing, my parent's room & living room's wireless down. and my room's down has affect my room & bathroom.

so always my Daughter has complain for myself. Last Resort is F*** Gov't and Power up the 5Ghz / 2Ghz DB in My Room's Device. but yeah, it's so very illigal thing and maybe confusing to others.

so Concrate wall is very block to this, I wanna my Daugther's well internet life(Daughter viewing Youtube etc. so need Very good Wireless system). so how to give a good wireless to my daughter's room?

Thanks for the map but it would be better if you can describe. witch room is yours and witch one is that of your daughter.
I thing the first things you should check is if you got a better signal is you move your access point and if there is something moveable in the path, like a metal shelf or so.
You should also check if switching to a different channel/frequency will bring any improvement.
The next step, in my opinion, would be to invest in a third Access Point (over cable is better , but you can use a Mikrotik Access Point as repeater to).
If you cant get WLAN to the wall and aren't allowed to lay network cable, power line adapter could perhaps help.