Does God answer a mother's prayer against her daughter that she be given a poor husband who cannot find work, knowing that the husband was comfortable before the marriage?

The Sharia (definition) prohibits supplicating against children, and it is hoped, out of God's generosity, that He does not answer a parent's supplication against their child at a moment of anger. The straitening of provisions your husband experiences does not necessarily mean it is due to his mother's supplication, as the apportionment of provisions is in God's hands and does not indicate His pleasure or displeasure. If a servant feels a lack of success, they should review themselves and renew their repentance, for the self is to blame when there is anything other than good. We advise you to be patient and maintain a good relationship with your husband, to have a good opinion of God, and to cooperate in obedience, seeking forgiveness, and relying on God, for "And whoever fears Allah – He will make for him a way out And will provide for him from where he does not expect. And whoever relies upon Allah – then He is sufficient for him."