Converting Shakou to PF (We were about to do this going up to 4th level, which I think Shakou is eligible for as well):
PF Rogue
BAB and saves remain the same as 3.5
Rogues now get d8 hit die, the easiest way is to add 3 to your Grace, then add the roll for 4th level.
Other class abilities remain the same but she gets two rogue abilities (for 2nd and 4th level) which you can choose from the list from the page above.
Skills will need the most work, as some have been combined. However, it's easier to work with class and cross-class skills. Shakou will have 40 skill points (8, plus 2 Int, per level) which she can put in any skill, maximum 4 ranks. Class skills get a one-time +3 bonus.
(I think Rogue makes a lot of sense as one of the nai-nek-chai's favoured classes, which means that for each level she can either add another skill point or another hit point (Grace)).
Of her existing skills, Balance, Jump and Tumble are now all part of Acrobatics. Gather Information is now a part of Diplomacy. Listen and Spot become Perception, and Move Silently and Hide become Stealth.
Leopard stats are not significantly changed, except that they now get a +4 racial bonus to Stealth in undergrowth as opposed to any previous racial modifiers. Nai-nek-chai abilities remain the same. Although PF characters get a net +2 ability score bonus compared to 3.5, we didn't go with this as it was too much upheaval.