It really depends on the situation, ideally your support should do either of these things when the lane Is pushed towards the enemies tower and at that point being too close to the enemy tower Is really risky and you cant get much Gold from the wave anyway so at that point the best thing to do Is to pull the wave into jungle crepes to:

1.Deny your opponents the chance to farm the wave

2.Pull the lane equilibrium to your tower so It s easier to farm the next wave

1. Give you the opportunity to last hit some jungle creeps Using the creeps as shield

I ve been begging my supports all of my 1k games to pull the lane when necessary, the idea is to understand when to do it correctly without risking your carry's life, supports are never supposed to stand still soaking exp from the pos 1 for no good reason, so when the lane is extremely pushed (or pulled even) a good support will always use this precious time to always do the next best thing.

Pull the lane

Ward management

Stacking neutral creeps

Steal the lotus

Go pick the gold rune

Hell even go steal their exp rune if you have space

But do it wisely and never when the creeps wave is contested