Christine Quinn isn’t sitting on the sidelines amid her husband’s arrest for alleged assault with a deadly weapon — she’s going on the offensive and gearing up to ask for further protection … TMZ has learned.

Sources with direct knowledge tell us the “Selling Sunset” star is actively speaking with attorneys right now — as we’re told she’s prepared to lay out her history with Christian Dumontet … something our sources say has been up-and-down through their marriage.

We’re told that before she even entertains what to do with her marriage — including the possibility of considering divorce — protecting her and her son is her top priority right now … which is why our sources say she wants a restraining order.

We’re told Christine seems primed to make further allegations against Christian — which is why she’s meeting with lawyers … because we’re told there’s lots to detail about what she claims went on behind closed doors, even before the incident that went down on Tuesday.

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Our sources do tell us that, for now, Christine and Christian’s relationship feels irrevocably broken — but until a divorce filing is in … you never know what might happen. All we know is that Christine is dead-set on getting an additional legal forcefield around her ASAP.

As we reported … the emergency protective order provided to her by police lapses in 7 days — so by Wednesday, Christine will need to file for a TRO if she wants additional legal protection.

Christian, of course, was arrested twice in 2 days this week stemming from an alleged incident that cops say involved him throwing a sack with glass at her .. and hitting their kid.

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We’ve tried reaching out to Christian without any luck.