Lily, or Another Sister?

The young woman in the left picture is most likely one of Lily's sister in her wedding party.  And the woman on the left could be the same sister in 1914 or (I think), it is Lily.  Her husband, Lionel Waller, would have been back in uniform in late 1914, as Britain was at war, so that explains why he is not in the picture.  I shall ask Cousin Joy what the date of the wedding was.