Why you need Astrid Mikkelsen as early as possible.
Astrid is one of the best resource gatherer we have right now.
She will always bring one supply home, if mission is providing it or not.
She also brings + 1 asset if mission is providing one, so 2 assets with her not one.
It is good to have her early. She will solve all Resource Issues you might have. She is doing the footwork and your big Agents can try to make the Expansive missions with 5 supplies and 5 asset cost.
Just send her on a 15 minute mission that provides 1 asset and she comes back with 1 supply and 2 assets.
All your concerns about resources are gone with her