Where should I wait at Suvarnabhumi Airport for my mother arriving in Bangkok?

There are two exits from customs so important to specify the gate you will be waiting at. Gate 5 is a good choice.

Arrivals is on 2nd floor. After she pass the immigration, she will collect luggage, then customs, then she will come out. When she comes out, she will trun right thats everyone heading to. Tell her to look at her left side where she can see the gate numbers 1,2,3 etc. You pick the gate number (for example 5), wait there and tell her to look around (from your direction, those numbers will be on your right side). Or you can also tell her there is a sign "meeting point" where everyones waiting and your able to see whos coming out. You cant go further than that point.

You can take a taxi from departure floor too

You could always go to the signed “ meeting point” on the flight arrivals level,,

Turn right out of customs. Tell her to walk down from gate 10 to 5 where you will be waiting. Very easy, this is how i meet my elderly parents and never a problem. Also a good idea is for them to carry an Apple air tag, this way you can track their progress and location incase they get lost. Thats if you have an iPhone of course.

ops tip

wheelchair man will stay with her till she finds you give them a til

Get your mum to book a wheelchair (free) when she checks in, problem solved

Tell her door 3 floor 2

Tell her to meet you where all the taxi pick up with there name boards... go out of customs tell her to turn right you can wait there

Arrivals is on the second floor.

Floor Number 2