I borrowed this fake example from the other question (in my revisions).

I saw a girl dancing at a club. [At that moment] I thought she (is/was ?) so attractive that I (can't/couldn't ?) help but ask for her phone number.

After introducing the clause with At that moment or even without it, should I use is or can? what is the general rule? Are there other occasions that I can use present in past?

I borrowed this fake example from the other question (in my revisions).

I saw a girl dancing at a club. [At that moment] I thought she (is/was ?) so attractive that I (can't/couldn't ?) help but ask for her phone number.

After introducing the clause with At that moment or even without it, should I use is or can? what is the general rule? Are there other occasions that I can use present in past?