It's possible to combo into a bounce cancel after 1 and B2.
1, Bounce Cancel, B3 (21%)
B2, Bounce Cancel, B3 (23%)
JI2, B2, Bounce Cancel, B3 (28%)
Harley has many ways to combo into her super with her unclashable attacks. It's possible to follow up her super with B22 for an extra chunk of unclashable damage.
JI2, B22, Super, B22 (50%)
Also works as an A2A combo. Does 48% without the JI2
B3/F3, B22, Super, B22 (47%)
Harley can forward dash under the opponent after B3/F3 to switch sides and continue the combo
F23, SS, B22, Super, B22 (50%)
No need to do the Silly Slide when in the corner
1/D1, Super, B22 (43%/42%)
For punishing
JI3, B22, Super, B22 (54%)
Corner only