FLR (FP) form leading to FLR M application

[saturday]

Hi everyone.
I am British citizen. my daughter is 3 year old also British. my wife came from Pakistan in 2020 on family route her visa sticker saying non standard 1 partner , meaning she is on 10 year route to settlement visa

I tried to fill up form family partner route at the end after filling up all details it takes me to IHS payment where it says FLR M visa.
please let me know what option I should choose so I can fill up right form.

Lastly her visa expiring on 10 sept 2023. can I apply fee waiver? If I apply fee waiver and get answer let say at the end of september 2023. will she be considered 20 days overstayer.

I will be very grateful to you if anyone help me to understand above points

[saturday]

I am still waiting for response . can anyone please help me this regard