Why doesn’t my Hellea work on gbah (read desc.)

I use her with tesh, wind homu, Lyn, and Kona.

She goes first and uses s3 on the first wave. Then tesh does his thing and Kona does his thing - then it’s onto wave two where Hellea doesn’t have her s3 and doesn’t land def break on the mid boss. The same thing happens when facing the giant too. What am I missing?

I use her with tesh, wind homu, Lyn, and Kona.

She goes first and uses s3 on the first wave. Then tesh does his thing and Kona does his thing - then it’s onto wave two where Hellea doesn’t have her s3 and doesn’t land def break on the mid boss. The same thing happens when facing the giant too. What am I missing?