Bismihi ta'ala
Heaven is a place of reward and bliss. There is no taklif in Heaven. There are no ahkam, or rulings or laws. Women or men do not need to observe mandatory laws that are only legislated for us here in this dunya.
We just need to make sure we perform our duties in the best way possible, so that we are fortunate and blessed to end up in the everlasting abode of Heaven, in shaa Allah.
And Allah knows best.