I left out the Nigerian part because there are no Nigerians on this forum.
It’s obvious the mother wants Somali over a white girl. Go and argue with the mother.
The irony is the cadaan girl would likely be less prejudicial as would her family toward the Nigerians compared to Somalis. Let us not lie to ourselves. Also, Nigeria is a tribal-based society, and many of them prefer marrying within or to similar others.

I swear if Somalis were any lighter, they would have their Black card suspended and revoked. Be happy you are at most medium olive. I think
@Laiis is going too hard with the "but they are racist and cadaan-loving" trope. Why wouldn't they prefer a hue or features similar to theirs? Also, let us not act like Syrians would universally accept others. That isn't true. Some highly emphasize Deen others don't. Some emphasize both Deen and shared culture or tribe/ethnicity. Some want someone who can assimilate into their group. Others don't care about shared culture or faith but have an aesthetic preference. It is up to them, and we shouldn't act like Western madow (men) begging everyone to marry them or exclaiming racism when it could be cultural and linguistic incompatibility. That's what happens when your frame of reference is always that of a victim. Also, we know that Somalis aren't fans of foreign-looking madows. Given their pastoralist background, they don't like to marry out as often. Imagine a criminal looking down on a fellow felon. They have no place to speak or complain because they, too, are insular, if not more.