Alexa appears in MySims (PC) as one of the 6 exclusive new characters.
When Alexa says "I've learned all I can about Robots, Assistant. I think I'm going to spend some time studying up on Rocket Ships!" at Star Level 5 in MySims PC, Alexa seems to be referring to MySims Kingdom she and Dr. F are planning to build a rocket in Rocket Reef.
Also when Alexa says "Someday I want to build a life-sized Sim Robot, like my hero, Dr. F, did!" This may be a reference to the creation of Makoto, T.O.B.O.R. or Proto-Makoto.