Mudgalapurana 4.10.37

4.10.37

tato gaṇeśadūtena nītā svānandake pure |
brahmabhūtā ca sā jātā vratapuṇyaprabhāvataḥ ||

Then, conveyed by a messenger of Gaṇeśa to the city of Svānanda, / she became one with Brahman through the power of the merit of the vow.