Its the weather, I have to tune my strings at the start of practice and 2 or 3 times during practice.
Violin tuners can be purchased for only a few £ from well known websites, its where I got mine from.
Strings from left to right are
G D A E
The G string is always over the highest point of the bridge.
Tune the A string first, it is the second from the last string on the right ( the thinest) is the E string and it is the highest pitch, so the A string is to the left of the E string.
Be careful when tuning the E string, it has a tonne of pressure behind it but tune the E string from the small fine tuners on the tail piece, if possible.
Check the bridge is straight, if you hear it creak during tuning
I suggest you tune your daughters violin right before her lesson, if you can.
Press wooden pegs into the pegbox in a clockwise direction to tune and only move the peg slightly and not a lot to protect the strings.
I started learning violin during lockdown and love it.
Hope this helps