Sayyidah Asma' bint Abi Bakr (may Allah be pleased with her) said: My mother came to me during the treaty with Quraysh while she was a polytheist, so I asked the Prophet (peace and blessings be upon him): Shall I maintain ties with her? He (peace and blessings be upon him) said: "Yes."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20714