Defender Alex Greenwood, midfielder Georgia Stanway and striker Lauren Heimb, among those who were already lost through injury, but Yumman was in a positive mood while examining the Friday match.
England started the Women's Nations League campaign with a draw in Portugal before defeating world champions in Spain 1-0 in Wembley in February.
Many Assad players were in good condition, including Arsenal striker Alicia Rousseau, the second scorer in WSL this season.
“What we saw (since then) in the last camp was many competitive games. It was really fun watching it and I saw that the level is rising again.”
“There were great challenges with games that involved many England players, and that was really good in seeing it.
“You can see a lot of players who have grown with confidence in a good place.”
Captain England Leah Williamson, who plays with Rousseau in Arsenal, believes that the attacker is playing with confidence.
Rousseau scored 17 goals in all competitions this season and is the best scorer in the Women's Champions League.
“I think everyone will always say how nice it is Alicia and everyone wants to see it works well for this reason,” said Williamson.
“But to be a ninth number in any team, you must have this type of arrogance – but confidence in you.
“We all want to see Elissia playing the way it is and I hope you can carry it because it deserves it as a human being and works hard for it.
“We know the talent is. When you score goals, she gets confidence and retracts the team. The team also appreciates it!”