A woman who marries during her waiting period and they are separated: with which waiting period does she begin?

Salih bin Muslim (may Allah have mercy on him) said: I asked al-Sha'bi: If a man divorces his wife and then (during her waiting period) another man marries her, what is the ruling? He said: Sayyiduna Umar (may Allah be pleased with him) said: The two of them are to be separated. She completes her first waiting period and begins a new waiting period from the second husband, and her dower is to be placed in the public treasury (bayt al-mal). The second husband may never marry her, and the first husband may send her a marriage proposal.

And Sayyiduna Ali (may Allah be pleased with him) said: She is to be separated from her (second) husband. She completes her first waiting period and observes a new waiting period from this one. She is given the dower in return for what he made lawful of her private parts, and both of them become suitors (who may propose to her).

Al-Sha'bi (may Allah have mercy on him) said: If a woman marries during her waiting period and then the husband and wife are separated, she begins a fresh waiting period of three menstrual periods and also completes what remained of her waiting period from the first husband.

And Ibrahim said: She completes what remained of the first (husband's waiting period) and begins a fresh waiting period of three menstrual periods (quru').

Al-Hakam (may Allah have mercy on him) said: The two of them are to be separated. The woman completes her first waiting period and then begins a waiting period for the water (semen) of the second. She will also receive the dower from the second husband. When her waiting period is over, if she wishes she may marry this second man, and if she wishes she may marry someone else.