Word meaning to scrutinize skeptically?

The word I'm looking for is how one should be in order to avoid getting phished or scammed. It's not specific to that circumstance, but I'll use it for the sake of easy context.

As in,

She checked the URL before clicking, and avoided answering the question about her mother's maiden name, she was so _____!

Adjectives or verbs are fine.

Words that are close but not perfect include:

Scrutiny: it seems to be more about, i.e., looking over your work trying to find mistakes, and lacks the defensive connotation I'm looking for.

Skepticism: it also doesn't imply defensiveness in the way I'm thinking. It also doesn't imply savviness or correctness, i.e., climate skeptics.

Suspicion is close, but is maybe TOO negative and sounds more like paranoia. It should apply equally to not clicking on shady emails as it does to logging into your bank's website and checking the connection security. More about consistently paying attention.

Solution 1:

Vigilant. It's a word that exemplifies the fact that people are out there actively trying to get you and that you should be cautious:

keeping careful watch for possible danger or difficulties. — Lexico

As in:

• Is That Email Legitimate? Remain Vigilant by Spotting Email Phishing Scams

Solution 2:

You could try the adjective prudent — characterized by, arising from, or showing prudence.

She checked the URL before clicking and avoided answering the question about her mother's maiden name, she was so prudent!

Here’s the definition of the noun prudence (see especially 4):

1 : the ability to govern and discipline oneself by the use of reason

2 : sagacity or shrewdness in the management of affairs

3 : skill and good judgment in the use of resources

4 : caution or circumspection as to danger or risk

_{Source: Merriam-Webster — prudence}