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Hmmm, your mum has been through too much already. It is not fair your husband is behaving this way after all your earlier concerns. Please this is a very delicate issue and should be handled with wisdom and patience.
Telling your mother how your husband feels is not necessary because I am sure she already knows that from his attitude towards her. It's also good that she has contributed to helping out and refraining from causing arguments.
Your husband is the one who has some talking to do. He is bottling up some thoughts in his heart which is the root of his disaffection towards her. You need to get to the core of his heart so that he will speak up. HE HAS TO SPEAK UP!!
Finally, you need to pray, pray, pray. How is the spiritual altar in your home? You need to uproot every spirit of disaffection and malice, scatter satanic altars, take captive of every thought and bring them in obedience to the name of Jesus.