Cp started tumbling already able to do forward and backward rolls, cartwheels and round offs.
From there the order in which she got things isn't necessarily things that were easiest, but I'll try:
Back walkover
BHS standing first, running second
Front walkover/BHS step out (I'm sure the step out was easier, not sure which she got first)
Running tuck
Standing tuck
Running layout
Toe tuck
Punch front (super easy for her)
Aerial
Running full
Punch front step out
Whips thru to tuck, layout, full
Front handspring
Arabian
Whip punch full/layout
Whip punch full has been landed but isn't yet done consistently
Some of these skills took her months to perfect while others were super fast. I would say the running tuck took the longest, the punch front the quickest.