Singer had a previous common-law wife, Mary Ann Sponsler, who had Isaac arrested for bigamy.

Isabella and Isaac moved to Paris, then to Oldway Mansion in Paignton, on the Devon coast in England, because New York society frowned on his many "families."

On 8 January 1879, Isabella married the Dutch musician Victor Reubsaet [nl] and settled in Paris.

Internet rumours have suggested she was his model for the Statue of Liberty, though this claim was rated "false" by Reuters.

[5] Reubsaet died in September 1887 and Isabella was married, for the third time, in December 1891, to the art collector Paul Sohège.