remember her pain remember the losses (19-20)
Whenever people have been through a traumatic experience, one of their biggest fears seems to be that future generations won't remember their suffering. Remember the saying "history repeats itself"? That's precisely the sort of thing this poem is trying to prevent. Sure, it's good to change – but you still need to remember where you came from.
now she is striding although she has lain. (24-25)
Want transformation? This is the entire movement of the poem in a nutshell.