the wider string spacings and spider fingers have been mentioned.

Especially spider fingers on the low E string and not lifting your fingers so all 4 fingers are still holding a fret. Included in Lisa's beginner sections.

This is more difficult at the first four strets so go higher up the neck and work your way back down to discover the spot you can no longer make this finger stretch.

This also applies to some of the more difficult chord fingerings. The C and G chords , maybe the F chord.

you can also practice these fingerings higher up the neck.

Totally wrong sound and no longer the correct chords but does let you see if you can make the correct fingerings where it is not such a stretch.

Again work your way back down the neck , pausing where the stretch is a struggle but eventually ending up back in the correct positions.

5 months is not a long time in guitar time . Cut yourself a bit of slack here

Good Luck

Dave