Yes. Your Mother Will Need To Have The Medical Done For The Extension Of The Visit Visa. There Is No Such Restriction For The Medical To Be Done Within 10 Days Of The Arrival.

After The Medical Is Cleared, Just Go To The Main Immigration, And Into Booth No 4, Take A Coupon, Give The Original Passport, Visa Copy, And Your ID, Wala The Visa Will Be Extended With In 5 Mins,

You Can Get It 1 Month Extended And Then Afterwards Get It Extended For 2 Months More, Any How Medical Is Required Only For The First Time.