"My best friend only hits me up when she needs help or wants to vent and doesn't show any interest when I talk about my problems."
"My best friend only hits me up when she needs help or wants to vent and shows no interest in my problems."
"My best friend only hits me up when she needs help or wants to vent and shows no interest when i talk about my problems."
Your third version sounds most natural. The word 'shows' is in line with the previous actions; and has the same level of brevity.
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Your third version sounds most natural. The word 'shows' is in line with the previous actions; and has the same level of brevity.