That's not bad at all. Yes, she does need to refine her muting, especially between chords. And she needs to really get the chord transitions down clean.
Both of these will come with time and discipline.
Muting the strings comes in very subtle ways of using both left and right hands/fingers to cover the strings and usually the least amount of movement possible to mute the strings is the goal.
For the chord changes, if she slows down just a bit (for practice purposes) and concetrates on getting her fingers into position, she'll gradually speed up to tempo and the changes will be clean.
What I hear that's good: her strum seems to be close to the original song and it in-time (when she nails the chord). She seems to have limber fingers and she's attempting chords beyong the open position kind.
That's all good stuff.