Lata Mangeshkar had donned name Anandghan to compose Marathi film music in the 60s. He provided music to the following movies.
Mohityanchi Manjula (1962)
Maratha Tituka Melvava (1964)
Saadhi Manse (1965)
It is not clear why she used this name. Was it to avoid diluting her singer brand? or was it to avoid appearing as a competitor to other music directors of the time?
Hemant Kumar's singing career was impacted the moment he started providing music to the movies. Other music directors dropped him as a singer. Lata was always keenly aware of these things. Perhaps this is the reason we did not see a lot of composing from her.
She had also provided music to a Marathi movie in the 1950 (Raam Raam Pahune) under her real name.
Here's a song from a movie Saadhi Manse.