चल रही थी

was going on

→ चलना
phrase Rare #9,361
was going on Used with a feminine singular subject; depending on context, it can also mean “was running,” “was playing,” or “was going well.”
HI: बैठक चल रही थी।
EN: The meeting was going on.

वह चल रही थी।

She was walking.

— かぐや姫の物語 (2013)

आंधी भी चल रही थी।

A storm was also brewing.

— Dhamaka (2021)