She's just using you as a tool - she only contacts you when she needs help.
Tips
culture
工具人 describes someone who is only valued for their usefulness - fixing things, paying bills, driving people around - with no genuine emotional connection. Common in dating contexts (被当工具人 = being used) and workplace settings.
memory
工具 (tool) + 人 (person) = a person reduced to being a tool. Literally a 'tool-person.'
