By all means do whatever investigations and trimming and treatments you can without stressing her and without turning her.
But any little thing that they would normally shake off is exacerbated by the weight they are carrying. My co-farmer on the moorland farm used to tell me, "Yes, well, you do get footsore, fed up and find moving about hard work in the later stages of pregnancy!"
As long as she looks bright and is eating and drinking well (make sure she can get to fresh water easily if she's not moving about and as far as she would usually), I wouldn't be too worried.
Once they've lambed you can give their feet a good thorough MoT.
