Derevi says that a creature you control needs to deal damage to get the untap trigger. So to answer your question, no you cannot untap Jalira with Derevi after Derevi attacks, you need to wait for Derevi to deal combat damage to an opponent first. Once you have done that, however, you can target Jalira with the untap ability, use here polymorph ability, and then finish untapping her.
Yeah. You put the untap ability targeting Jalira on the stack, and before that ability resolves you can do anything that can be done at instant speed i.e. cast instant spells and activate most activated abilities. Since Jalira's ability does not have a clause stating when it can be used, you can use it at instant speed.
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or would that be impossible because of timing issues?
Thanks