Size

Yes she started to flowering but only just the top of the plant. She have just six leaves and just have a small bud on the top. Do you think good idea cut the top of the plant? Thank you

Has she started flowering? Two months is a long time for an auto. Most autos flower at around 30 days. If it's been in flower for a while then after a week or two of stretching they don't grow much. If it hasn't flowered yet at all it's probably a photo not auto and of that's the case then transplant away

A lot of autos don’t do well with transplanting. Those that do need to be done when they are younger so they can recover from the stress before flowering. If your auto is already two months old it is most likely already flowering and you really don’t want to stress it by transplanting. She probably wouldn’t grow much more at this point as the stretch is over or almost over. I would just focus on getting her the right nutrients, making sure you don’t under/over water, and keeping her healthy.