Her best combo damage probably starts with a lvl 3 j.2c fatal counter with 3 poles set up, land BBL, 236a 4d BBL frog combo into frog w/ putting out a pole, set off pole air combo.
You might even be able to do some slightly special combos after the frog due to the FC extra 2 frames untechable time. It might even be better to bypass the frog all together and do some undiscovered FC air loop. Too bad nobody cares about Rachel anymore so nothing gets discovered.
I bet that begins to approach 5k! To bad it will never happen in a match. Ever. Not kidding, it won't happen a single time.