Hi Wendy
Do you have her death certificate or did you find her in the London Burial Records?
Some of the Poor Law records held at the London Metropolitan Archives are available online at Ancestry. However, they aren't indexed.
So if you have access, make your way to the London records and look for the Board of Guardians records which are ther under baptisms, marriages and burials.
The borough is Tower Hamlets, the parish is Stepney, then scroll down the admission & dsicharge registers until you find Mile End and the correct years.
Also have a scroll throught the Creed Registers
As they aren't indexed you'll have to look through all the images until you find what you are looking for.
Hope this helps.
Dawn