indram nas tvabhiseksyamo
brahmana codita vayam
avatirno ’si visvatman
As ordered by Lord Brahma, we shall perform Your bathing ceremony to coronate You as Indra. O Soul of the universe, You descend to this world to relieve the burden of the earth.
Surabhi makes it quite clear in this verse that she has had enough of the leadership of imperfect demigods like Purandara (Indra), and now she is determined to directly serve the Supreme Lord. Since Brahma has ordered her, her attempt to coronate Lord Krsna as her personal Lord is authorized by higher authority. Moreover, Lord Krsna Himself comes down to the earth to relieve the burden of self-destructive, mundane administration, and thus it is perfectly consistent with the Lord’s own purpose that He become the Lord of Surabhi. Since the Lord rules millions of universes, He can certainly take care of mother Surabhi.
In fact, Surabhi wanted to bathe the Lord for her own purification, and she earnestly makes her proposal to Visvatma, the Soul of the universe, Sri Krsna.