Learn Dutch: Met gekruiste armen leunt ze tegen de muur. - With crossed arms she leans against the wall.

Yes! While this sentence simply uses gekruiste as an adjective before the noun, you can absolutely use the 'met + noun + participle' structure taught in this lesson. Saying met de armen gekruist or met haar armen gekruist is extremely common and means exactly the same thing.

Why is there an -e at the end of 'gekruiste'?

Gekruist is the past participle of the verb kruisen (to cross). When you place a past participle in front of a noun to describe it, it takes on the role of an adjective. Because armen is a plural noun, the adjective gets the standard -e ending.

Why is there no possessive pronoun here, like 'met haar gekruiste armen'?

In Dutch, it is standard practice to omit possessive pronouns for body parts when the owner is obvious from context. This is especially true for fixed expressions describing a physical state or posture, similar to how you would say met blote voeten (with bare feet) instead of explicitly saying 'with her bare feet'.

Why is the word order 'leunt ze' rather than 'ze leunt'?

Because the sentence begins with the prepositional phrase Met gekruiste armen. To satisfy the V2 (verb-second) rule, the finite verb (leunt) must occupy the second grammatical position in the sentence. This forces the subject (ze) to swap places with the verb, resulting in inversion.