Learn Spanish (Latin America): Ahora ella es imparable, pase lo que pase. - Now she is unstoppable, whatever happens.

It literally translates to "happen what may happen." It repeats the verb pasar (to happen) in the present subjunctive (pase) because it refers to a hypothetical, unknown future event. This repeating (reduplicative) structure is the standard way to express "no matter what [verb]s" or "whatever [verb]s" in Spanish.

Can I use this same repeating subjunctive structure with other verbs?

Yes! This is a very common formula for expressing indifference to an outcome. Some frequent examples are cueste lo que cueste (whatever it costs / at all costs), diga lo que diga (whatever he or she says), and sea lo que sea (whatever it is).

If I wanted to say "she was unstoppable, whatever happened", how would the phrase change?

You would shift the repeated verbs into the past subjunctive (imperfect subjunctive) to match the past context. The phrase becomes pasara lo que pasara (or pasase lo que pasase). The full sentence would be: Ella era imparable, pasara lo que pasara.

How is the word imparable formed?