IVF is not haram, provided that she is in a desperate need to have a child. The wish is not an enough justification to do so. However, if she did, she can not name the child as her husband son.
The father will be the owner of the semen, if known. Otherwise, he will be with no name.
There is a widow lady she lost her husband 10 years back and she is in menopause stage and she has no issue recently. She heard about IVF method that with the help of IVF a lady with Menopouse get pregnant and she want to get pregnant with this method. But she would like to know if the child she births will be jaiz or not.
There is no problem in it per se, however, since the process may involve masturbation, and implanting involves touching and seeing the private part, insemination would only be allowed when the parties involved may face difficulty in their life which is not normally bearable.
Also, regards to the matters of inheritance and Mahramiyat the parties involved need to refer to the specific Islamic Law rulings.