It is a phase.
Whenever, a baby hits 'new' motor-skills and hits milestones... they do this.
And no, they do not yet know how, to do the "sequencing" of their movements. Thus, they will stand or pull-up and not know how to then sit back down and then lie down, to go back to sleep.
Crying it out, will not help.
Because, again, they do NOT know how.... to do the entire 'sequencing' of their movements, yet, nor do they have it mastered.
Their entire range of movements and coordination.... is not, in sync, yet.
And, they do this, standing up etc., repeatedly. Because it is instinctual and they are 'practicing' their skills. Which are not yet, developed... but just blossoming. It is normal.
It is a phase.
They are not yet all coordinated nor do they have, perfect balance yet over all of their appendages.
Yes, it wakes them and you.
But, until she is older and 'masters' her appendages/coordination and sequencing of her movements... it will be this way.
You have to, help her.... once she is pulling-up and standing, you do need to put her back in a lying down position. They don't know how yet and thus, crying it out is not going to help.
This is normal growing-pains. But is a phase.
Also, they may also be teething at this age. And, hungry. Being that 6 months old 'was' a growth-spurt time. Their appetite, increases as well when hitting new changes and development, they get hungrier. So that can be waking them, too.