Unless Lisa states otherwise in a lesson, and she does mention the specific desired level of demonstrated competency at times in lessons, I'd suggest the objective should be when playing each the progressions, the chord changes are occurring effortlessly played with rhythm without too much concentrated concious thought required other than awareness of that.

If your attention can't maintain mojo with those songs, you can spice it up with songs you prefer using similar and different progressions. There are many many songs which use 3 maj chord or 4 chord progressions. "Wild Thing" A D E, or "Kumbaya" C, F, C C, F, G etc or involve a simple Em. e.g. D G Em A, : G, Em G, A, to G, Em, Em, D. Troggs "Love Is All Around" in original key of D, or in G if preferred.

Those open chords are fundamental building blocks for so much. Doesn't have to be perfect, but you should be able to play them at tempo with rhythm within context of a progression within a song without too much difficulty and other than the occasional mistake. That's my take.