Thank you for explaining this.She's not doing that.
All she said is that the time is now to switch tactics. Which it is. And Biden knows that. Having a few Congress critters saying so in public actually helps him especially if it causes the general public to start expressing those ideas to their own representatives.
For a party to be successful it needs room for the push and pull of its different constituencies. AOC has an important role in that on the left side of the party.
The most guaranteed failure for Democrats is timid centrism acted out in fear of Republicans. That's not Biden's strategy in any way and he needs the vocal voices on the left as much as the more moderate ones.