Labels for words matters. The two verbs in your example are "slipped" and "threw".
Up can be an adverb (I was sick and vomited up everything), a preposition (They took a cruise up the Rhine), an adjective (the mood here is resolutely up), a noun (You can't have ups all the time in football), etc.
In your first example, up is an adverb (a word or phrase that modifies or qualifies an adjective, verb, or other adverb). In your second, it is according to @Edwin Asworth, also an adverb. Please see below. However, if one presumes she threw her keys up into the air, it could be considered a preposition.
Also, in (Ame at least) English, throw up means to vomit, so that threw up her keys will first strike someone as a bit awkward, although in context it will be understood as it is meant to be.
Edited to reflect @Edwin Ashworth's information.
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