I heard about this story before, but I can't remember where to find it.
The story of Saraswati taking princess Lila to another universe to show the next birth of her (dead) husband is present in the scripture Yoga Vasistha.
The name of princess is Lila. Her name is Arundathi in her previous life. The name of Lila's husband is Padma and his name is Vasistha in his previous life.
The names of her husband are as follows
Vaistha (previous life) -> Padma (current life) -> Viduratha (next life)
The names of wives of Padma are as follows
Arundati (Vaistha's wife) -> Lila (Padma's wife) -> Lila (Viduratha's wife)
It is important to note that same Jiva is present in Vasistha, Padma and Viduratha. But Padma's wife Lila is different from Viduratha's wife Lila. Arundati and Lila has same Jiva, who is different from the Jiva of Viduratha's wife Lila.
Saraswati sent Padma's wife Lila to Viduratha's universe. Later, they visit Vaista and Arundati's universe. Afterwards, they both visit Viduratha's universe and finally arrives to the original Padma's universe. Viduratha's wife Lila also arrives to the Pama's universe and finally Padma continues to rule his kingdom along with two Lila's.