"IMO, it is disgraceful the way Ms Seacole is overshadowed by the egotistical and narcissistic Nightingale character."
What an extraordinary statement; is Nightingale attempting to maliciously overshadow Seacole from beyond the grave?
As for 'egotistical and narcissistic', it's been hard enough for women to make their way professionally in the 20th century never mind in the 19th, against fierce opposition from family and a prevalent view of nurses as women of ill-repute. Perhaps you'd like to fling some more of the insults women still receive in male-dominated professions? Hysterical perhaps?
There's room for both to be remembered without trying to trash either one.
They study her in my DC's infant school alongside Florence Nightingale they cover them both equally. My Ds's really enjoyed finding out about her. I expect DD will be finding out about her later on this year.