1)
Is there any connection between Avishag ha'Shunamis and the Shunamis who hosted Elisha?
1.
Pirkei d'R. Eliezer (33): They were sisters. 1
1
Radal (on Pirkei d'R. Eliezer): Gechazi said that the Shunamis' husband is old (Melachim II, 4:14). This implies that she is not so old! (This was over 120 years after Avishag served David! Was Avishag born e.g. 100 years before her sister?! - PF)
