1)
What does "v'Chen Ya'aseh" refer to?
1.
Malbim: Each year, Elkanah would give a nicer portion to Chanah, Peninah would vex her, and Chanah would cry and not eat.
2)
Did Peninah anger her specifically when they came to the Mishkan?
1.
Rashi: Elkanah would give to her a choice portion to show love, and due to this Peninah would vex her.
2.
Malbim: She and Elkanah would pray then that she bear children, so she was more than pained then, and Peninah would vex her then.