Can my Mother Execute Will on Pending Partition Suite... which is posted for Final Judgement...

My father purchased land along with his 3 friends.. (Co Partners)., after few years., my fathers friends decided to dispose of the property and insisted my father to sell his share (1/4th) Share as well.. which he didnt heed.. Neogiations failed.. and my father filed Partition Suite.. in 1997... in 2007., my fathers succumed to death., and we (my mother., brother and myself) impleaded into the pending suite as his Legal Heirs after his death.. Of late., my brother started to taunt and harass my mother badly.. verbally .. physically..and.. challenging her modesty and integrity before society.. of which my mother decided to execute a WILL of her Share in Pending Partition Suite.. She stepped in few Documents Writes office.. but to vain.. Can she execute WILL which is on my fathers name .. to the date.. and Pending Partition Suite... as we are Marked as P2, P3 and P4 Respectively after my father demised.... .. of her 1/3rd share on to beneficiar's names.. mentionining the site of Plot (about 150 Sq Yards)...