Help! Tried lots of Layer Combos for Sleep EZ 10000 & Still Struggling

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Similar to this topic, my wife struggles with bad hip pain. She is predominately a side sleeper, but does rotate to back too.
From what I have read here, I thought maybe that would be an indication of a mattress that is too firm to allow her hips to sink in alignment. Is that a good conclusion? We both think we are more comfortable is a softer mattress, I just want to make sure that jives with her symptoms.
It appears to have gotten worse in our awful brand new ā€œSā€ brand pillowtop innerspring mattress that we feel like is med/firm feeling.