Flatmate moved out but won't pay her share of the rent, what can I do?

I'm in Bengaluru and my flatmate suddenly moved out last month without notice. We both signed the lease, but now she's refusing to pay her share of the rent and utilities for this month, which totals ₹25,000. The landlord is threatening to evict us if the full rent isn't paid. I've tried contacting her, but she's ignoring my calls and messages. I'm feeling overwhelmed and don't know my legal options here. Can I pursue legal action to recover her share of the rent? What steps should I take next? Any advice would be appreciated.