her staying in business is most likely a combination of 1) guys not doing their homework before they call and 2) pure convenience. at times its hard to go off the radar for prolonged periods of time and guys will opt for a shitty trip over nothing at all. nobody is gonna believe it if u say it took 3 hours to get milk. but if shes 10 mins away, and u get a qv, u can be back with milk taking about "had a hard time parking", "it was a little busy. i let it clear out", etc. nobody will question it.
i have the exact same situation with lana. out of my list she is second to last(nina/jasmine is last). shes terrible. problem is convenient. so u end up sitting there debating with urself, "shes trash, stack it for x, she better" versus "shes right there, she knows me now, maybe it will be better this time".