PA - BM Keeps Getting Fired

UPDATE: In case anyone was curious, they did calculate based off unemployment collection which was about 60% of her last salary; so my husband does have to pay more despite his financial situation not changing. Doesn’t feel fair but I don’t make the rules.

Posting to try to educate myself more; my husband and I just went through a case around school so still paying lawyer bills for that. While in court for that, we found out BM was unemployed again. This is the 3rd job in 4 years she’s been fired from. Now she’s taking my husband back for child support. I’m pregnant and frustrated because it feels vengeful. My husbands salary hasn’t changed since the last time they went to court over child support; he also has proof of a list of refused expenses from BM. We pay for so much and care so deeply for my SD.

My question is - how do they consider and calculate support with unemployement? And will they consider that her unemployment has a history of her being fired? It feels unfair that we should continue to have to pay her more because she is failing to maintain a job. I’m obviously concerned about having an increase for child support as I look forward to bringing new life into this world.