The wife has the right to have her husband stay overnight with her, and she is entitled to kind treatment and intimacy. She has the right to ask for divorce if her husband fails to give her these rights. But if she agrees to stay and give up her rights, then she may do that and you do not have to divorce her in that case.
Muslim narrated (1463) from ‘Aishah (may Allah be pleased with her) that when Sawdah bint Zam’ah grew old, she said: O Messenger of Allah, I have given my day with you to ‘Aishah. The Messenger of Allah (blessings and peace of Allah be upon him) used to give ‘Aishah two days: her day and Sawdah’s.
This indicates that it is permissible for a woman to give up her right to a share of her husband's time, and to give her night to her co-wife.
But if the wife does not accept this situation, and she also does not want divorce, then you have to review your case and try to resolve the problem, give her her rights, treat her kindly and show her some appreciation, because she is the mother of your children and she has lived with you all this time.
We ask Allah to set all our affairs straight.
And Allah knows best.