In one episode, she basically implied that Kim was too dumb to get into college and that she didn't prepare for her future:
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Remember when she got mad at Kim and told her she needs to go on a diet because she was chosen to be on the cheerleading squad and Mo wasn't? Even though Moesha didn't even want to be on the squad, she only did it for Kim.

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Or how about when Mo (and Niecy) were joking about Kim's weight and Kim overheard them because they forgot to hang up after they called her on three way.

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Moesha was not exactly a nice person. She always thought everything revolved around her

She was a typical teen girl. She was ok!!! But had a lot to learn about being a real friend.

Despite Moesha possibly being pregnant and Moesha's brother having been kidnapped in the series finale not even ONCE did Kim or her mother (who also had known them) ever allude to Kim's so-called BFF's possible pregnancy or the BFF's brother's fate in their own spinoff's four year run. Hence, I guess in the end Kim couldn't have cared less what had happened to her bestie and bestie's bro.