I would ask the teacher for more details as term 1 Year 7 'physics' will cover only one/two topics & in a very particular way.
Just because she struggles a bit with these doesn't mean she will generally have problems - there are such a wide range of topics to be covered. It does seem quite early to be giving a level in a new subject. It could be based on only avery few marks.
Once you can pin point the areas of difficulty you may well find you or relative can help anyway.
Also ask DD if she understands the teacher - if not then encourage her to ask for concepts to be explained in different way - it may be that she & teacher are not on same wavelength
Not sure if this will get blocked - if so PM me - but BrightMinds have lots of science based toys - building electrical circuit based toys/ mechanical stuff. Lego & lego techincs have kits for teaching things like pulleys etc.
It might be that yor DD does better if she can see how things work (light can be tricky until you do it in practice with a torch, mirrors for periscope etc.)
Most importantly do not let her think she can't do physics. If she is good at Maths reassure her that as the Physics progresses alot of it is related to maths so she should find those bits easier.
I don't like to criticise teachers without fully understanding the situation but it does seem that in this case they have been quite quick to pass the responsibility over to you and book study at home! If she needs to 'work at it' then the school should also be providing proper support and specific guidance!