I like Alexandria Ocasio-Cortez. I think she's intelligent, a good politician, and not particularly evil. I would definitely pick her for most anything over a bottom-feeder such as Kyrsten Sinema.
But she's not a socialist. She's not even a progressive, at least not in any meaningful sense. She's a bog-standard corporatist Democratic party politician. She's not a bad person, and I think she has done and will do what she can to ameliorate the billionaires' inherent assholiness, but when push comes to shove, she'll take the billionaires' side over the people.
How could she not? She's a member of Congress. If her fundamental loyalty to the billionaire class were in question, she would be completely excluded from the business of Congress until she lost her next election.
Most importantly, Ocasio-Cortez has no outside institutional support for any kind of socialist or progressive agenda.
Socialists and progressives cannot simply depend on electing "good" people to political office. Socialists exert real power over the state, or take actual state power, by developing institutions outside of the capitalist- or billionaire-oriented official political institutions.
None of our socialist organizations are developing these institutions.