I went to the webpage that Thomas tells us about and translated it with the Altavista Babelfish. I found the picture of Alice's sarcophagus, which you can see below. If you look carefully, you can see her holding a small child in her arm.
The text about the sarcophagus reads (roughly translated from the German, this is my edited version for easier reading): "The cover of the sarcophagus was made by Sir Joseph Edgar Boehm, and shows not only Alice, but also her recently predeceased daughter Marie, which is also buried in the mausoleum. The lower part of the sarcophagus is a work by Augusto Varnes."