T2 is not as chaotic as T1 as it is more spacious. The objective of transforming this former military base into a mixed military-commercial airport was to alleviate MEX constraints.

NLU has one final challenge: desaturate Mexico City International Airport.

You will likely wind up standing to look for her. Mexico City International Airport is saturated. The other option is the bleachers directly in front of the customs exit - straight through the exit hall. You can grab a Starbucks and lean on a planter and see people coming out of the international side. Next to Starbucks there is some kind of fast food place but no place to sit. Take a taxi for around US$10 (there is a minimum ride charge) to Terminal 2 and wait for her downstairs (where she will come out) at the Starbucks which will mean she will walk to her right a few meters. With a one hour transfer time, you may feel late, but if your sister checks luggage, she will lose an hour while checked luggage undergoes security checks for luggage coming from the south so you should have time. There is a train connecting the two terminals, but it is technically only for people with boarding passes and only runs like every 20 minutes.

Mexico city airport code map