Tennat issues- asking for handicap railing after living for 2 yrs

[Ryan Passi]

Property in Los Angeles, CA. Tenant who is generally obnoxious but paying on time. Now asking that her mom who lives with her for past 2 years, now can't go up 3 steps to front door due to her knees. Is asking me to install a support railing on those steps.

Who pays for this? Am I obligated to install railing?

Also she is hosting Zumba sessions in the backyard without my permission with about 20-30 people. When asked got defensive and angry saying that she has every right to host friends and I can take her to court if I want.

What are my options?

Thanks for your help