All I can hear is her going on screaming "Where the F**k is this egg" lol only on Jak 2,
And great idea I shall not let her win!! lol
there's an easy glitch to get 250 eggs before you get very far into the game. since some eggs can't be obtained post-game. the hardest part she's likely going to have is trying some of the missions where they just throw waves upon waves upon waves of enemies and it turns out she has no dark eco left.
If she's getting the Platinum without using the precursor orb glitch, in which case she should probably hold off on getting the easy ones for now, then the Platinum trophy should be less complicated to pull off for both games in less than a month's time. If she's doing it the hard way, however, then the challenge will probably not meet up under the designated time limit.
There are about 300 orbs to collect in Jak II and approximately 600 in Jak III. The hardest part about these Platinums, aside from the gameplay difficulty, is tracking down every last one of those egg-shaped doodads. Going about these games legitimately could mean it would take at least a couple of months to get them both, considering you must not only get through the game itself but you must spend all that extra time figuring out where the item is and how to get there (and when).