pronoun

When "who" is an antecedent, does it need to directly touch the person it's referring to?

I.e. I called Sally, who urged me to move in with her in Texas.

OR

I called Sally, the mother of Selena Gomez, who urged me to move in with her in Texas.

1) In the second case, is the 'who' incorrectly referring back to "Selena Gomez"? If it refers to "Selena Gomez", how to write the second sentence to refer Sally?

2) In the second case, is the "her" incorrectly referring back to "Selena Gomez"? If "her" refers to Selena Gomez, how to write the second sentence to refer Sally?

3) In the second sentence if "who" refers to Sally, how to write this sentence to refer Selena Gomez?

4) In the second sentence if "her" refers to Sally, how to write this sentence to refer Selena Gomez?