Most women might have been horrified by the idea that she might be expected to help raise her husband's illegitimate child, conceived of an affair in the middle of the marriage. The situation with little Maisie was much different and it wasn't exactly as if Hermione was like most women. Besides, a large part of her felt like she owed it to Ginny to make certain that her daughter was kept safe and given a home. Guilt would likely plague Hermione for the rest of her life where it came to her former friend. If she had just been honest and stopped keeping that damned secret, she could've prevented that horrible night when Ginny was murdered. She knew that Antonin struggled, and would continue to struggle, with his own guilt. Together they could try to make it up to Ginny by loving her daughter and giving her a home where she was happy and allowed to be a carefree child. Something stirred deep within Hermione when she imagined the possibility of the four of them becoming a true family. She could open her home and her heart to the innocent four year old girl. It was the least she could do after what happened to the poor child's mother.