As someone who both jungles and plays botlane, I can say a couple of things about this. Unless myself or my partner make some serious mistakes, such as pushing tower after getting a couple of kills and forgetting to ward when we panic backwards because we got jumped or caught in turret fire, I'll only ping for help from a jungler if they're near me or if they want a couple of free kills. I don't mind not dying, as I get to sit and farm safely. I'd rather go 1/0/10 over dying at all as an AD Carry.
Now, from a jungling perspective, if botlane is falling hard, and theres a point as to where the lane is lost, I'm not gonna risk giving the enemy team more gold. Instead I'm gonna assist my mid or top if they're a snowballing type and help them as best as I can, whether it's pricking off stragglers or taking advantage of those trying to tower dive, I'll make them regret assaulting past the tower point. Now when I'm jungling I ususally try and get both scuttlers to get early vision on River, but I do hope that each of my laners wards their local areas as much as possible. If bot lane is getting ganked, and I'm at top, there's not much I can do, and I advise my bot laners to ward as much as they can. If they're constantly getting ganked over and over and end p being killed, I'll take advantage of the jungler and raid their jungle, as to prevent them getting small power spikes between early-mid game.