Netix
Maybe you could ask Steph to speak to her, or to ask her how she wants to be communicated with.

This will sound a bit strange, it is sounding strange to me as I write it, but maybe you could make her part of the family, like have a place for her at dinner, the children tell her about their day, make her feel like she is still loved. Maybe a picture of her, with a vase near it with her favourite flower, or a candle.