The hosts desperately need to beat the Indomitable Lionesses at the Accra Sports Stadium to stand a good chance of progressing to the knockout stage following a shock 2-1 reversal to Mali on Tuesday.
Bashir Hayford's outfit currently sit third on Group A's table, tied on points with Les Aiglonnes but three marks below Friday's opponents, who have won their first two games.
"First of all, I would like to thank Ghanaians for their support so far and also urge them to continue supporting us on Friday," Sumaila said on Thursday.
"It has not been easy for us these past few hours because we lost against Mali. We were down because we believed we deserved better.
"We went back and watched the footage of the game against Mali and identified certain things that we need to correct and the coaches are working on that, so hopefully we should bounce back to winning ways.
"All is not lost although I feel Ghanaians are expecting too much from us.
"However, we are going to do our best to make sure we beat Cameroon on Friday irrespective of what happens in the other Group A game in Cape Coast."
She was adjudged Woman of the Match as the Black Queens beat Algeria 1-0 in their tournament opener.