Capítulo 378: The Note Read:

It had been an hour since Angeal had left the mansion. With everyone left behind, Frey stayed for a while, being with the immortals as she also felt empty with them with Angeal now gone from the mansion so she could live with her father.

Yes, they know that they could visit her in her new home since they know where Professor Leon is living, but still, with Angeal gone from the mansion when she was raised here since Gladios came with her, the immortals felt like a part of them was gone since Angeal is a part of their lives.

Martha and Edwin see her as their niece. They loved taking care of Angeal and she was the sweetest girl they ever know.

Gwen is the same. She sees Angeal as her little sister. With Angeal being with her all the time as they did household chores together around the mansion, of course, now it will be a little bit lonelier since she's used to cleaning the mansion with her.