High blood sugar levels in the morning

Hi @gedlyJO, Seeing her doctor is the first thing to do.
From my experience as a diabetic and not as professional advice or opinion:
BSLs can go up for all sorts of reasons such as infection, stress and worry, change in diet and things with fancy names like Dawn Phenomenon (DP) (body prepares for waking up from about 4 am and this causes insulin to not work as efficiently in the early to ? mid morning). Why something like DP should appear is a quandary and I imagine the other causes are usually sorted first.
Looking up the eye drops for her glaucoma, Ganafort is the closest I could find to your spelling. If these are the ones, the side-effects and precautions include that one component of the drops can cause some drop in blood pressure and lessen the early symptoms of hypos (shakes, rapid heart beat ect). Perhaps the doctor can find something about rise in BSLs but I could not as a side-effect. (refr. netdoctor.co.uk).
I am guessing that your mum is on Lantus only because she is a Type 2 diabetic. If so, it may be that Lantus is no longer sufficient but perhaps it was safer for her to take Lantus and not the short-acting insulins before because of risk of low blood sugars (hypos). At the very least it sounds like good sound medical assessment and advice is her best bet. Best Wishes to you both !

Definitely get her to speak to her GP. I had a similar problem with Lantus, and was changed to another long-acting insulin - actually a lower dose, which immediately solved the problem. It seemed that my body was too used to the Lantus.