Hey there, at a minimum your ends should be sealed; conditioning young/new/immature Sisterlocks can lead to slippage at the root and unravelling at the ends.  It can take 12-18 months for ends to seal. 

If your ends are sealed and you're no longer experiencing slippage, you're more than welcome to start enjoying the occasional deep conditioning treatment to help reconstruct or replenish your Sisterlocks.