Think of cannabis growth like a manufacturing line between dayshift and nightshift.
To really dig deep into cell elongation you need to cover a few bases.
Photosynthesis drives gas exchange, this creates a cohesive suction pressure that draws water up through the roots and up the xylem and across the plant.
The drawing of water up from the roots and out to the air through the stomata is called transpiration.
Transpiration is responsible for creating tugor pressure within the plant.
The more transpiration that happens the more pressure is created, this is to be treated as a plant stressor. Can lead to plant "praying". Basically the plant grows like it gives itself a boner every night.
Turgor pressure is responsible for cell elongation in plants. It is the driving force behind cell expansion and growth, pushing against the cell wall and causing it to stretch. This process is essential for plant development and morphogenesis, allowing cells to grow and change shape.
A plant will slow down vertical growth once a ppfd threshold is reached, so long as the plant remains untopped the main stem will remain highest, top once or twice to create a candelabra shape as opposed to a evergreen tree shape.
Your internode spacing looks very good, all those buds could potentially conjoin on the cola to form one massive cola. There is no right or wrong growmie, she is looking on point, full steam ahead!