If she tries to get a mortgage and I have a judgement against her, she has to pay the judgement first, right?
No.
A judgment debtor doesn't have to do anything, much less pay the judgment creditor.
The judgment holder, that would you, must endeavor to collect the judgment.
Let's say your deadbeat finds a briefcase full of $100 bills totaling 500,000 (US Dollars).
The deadbeat buys a house for $400,000 using cash.
You'd have to discover the transaction and slap a lien against the house.
You still don't have one US Dollar from the deadbeat.
Deadbeat judgment debtors can live for decades escaping the grasp of the judgment creditor.
I'm sure you recall the $30,000,000 judgment against OJ Simpson, right?
To date only about $400-500K has been collected against that 30 mill.
That Wily Coyote never touched that clever roadrunner, did he, mate?
She might get a mortgage, many slicksters obtain same in the name of a close relative, friend, sucker, or lover.
If she does but not in her name, all you can do is curse under your breath.