My mother underwent incisnl hernia (due to previois laproctomy) laproscpic surgery 3 mnths ago. But hernia recurred in same place within 1 mnth. Adv?

Recurrence of hernia. After repair is always a risk, although this one happened relatively early. Unfortunately, she will likely need another repair. Get another opinion from another surgeon.
Talk to surgeon . There are risks of recurrence with any surgery. Make sure the surgeon sees your mom. If he/she did it laparoscopically then it was patched. The hernia may be fixed but still has a lump. The surgeon will do a thorough physical exam and order tests if needed.