Ripley and Queen reach an agreement: "Call off your goons and I won't torch your babies."
Ripley torches them anyway.
I know it was triggered by the egg hatching... but was that really Queen's fault? I think Ripley flexing, while badass, was a stupid move. Knowing they're all goners in the next few minutes anyway, she should have just booked it out of there. Not only that, she shot all the grenades at the egg-laying-intestinal-tract-thingy? Fucking aim for the Queen dammit! Again...badass... but foolish.
It's one of those things where it seems stupid but on a re-watch you get into it more. It gave us a chance to see her lose it and go crazy and give us her 'Predator moment'.
In a more 'acceptable' sequence, I would have liked it to go like this:
Ripley and queen reach a truce. An explosion rocks them, the queen betrays and orders the attack. Ripley fires back blindly through steam as she goes for the exit with Newt, hitting xenomorphs with her ammo, hitting the 'connection' between queen and the sack, launching grenades which destroy eggs as collateral damage. Out in the corridor, aliens continue to chase from behind and intercept them in front. The queen tears off her damaged connection and goes after them. Ripley uses up all her ammo and fire protecting them both as they make it into the lift just as the queen gets to them, they go up and end up in the same desparate problem.
I guess what made it to film was a cheaper and simpler sequence which gave the audience a moment of massive, destructive and personal revenge for Ripley.