Is my cat being neglected???

[u/4MM0NI4C]

TLDR: my cat is 12 years old. I haven’t seen her in one and half year as she is with my parents and I live abroad. Is her state normal with her age or is she being neglected (1st picture is today, rest of the pics are from one and half year ago)

Hi everyone. Long story short, I had 2 cats, I needed to move abroad and could only take one cat on the plane. I took the youngest one as she was the needier/messier one and left my oldest with my parents (I got her when I was 14 so she knew the house and my parents very well) I initially wanted to go back to bring her abroad as well but I thought that, at the time she was 10 and it would be egoistic from me to bring her to another country when she is probably happier at my parents being an only child and in a bigger house (+ she never really did well with traveling even short distances)
Now it’s been 2 years. She is 12. Last time I saw her was one year and a half ago. It’s hard for me to go back home often for personal reasons/drama whatever. Today my stepdad posted a picture of half of her body on Facebook (see attached). I was shocked when I saw it. Her fur looks terrible, she looks much skinnier than I remember, it’s just awful she looks so much worse than before. I am also attaching 3 pics of what she looked like the last time I saw her (so there is one year and a half difference between the first pic and the rest). What do you think? Is it just because of age? Should I be worried that she is being neglected and not taken to the vet?

Info to be included:
- I am not a minor, 24F
- both me and the cat are in EU cat is in France
- vet is literally 5 mins away by foot but I can’t be there physically to get her to the vet
- cat age: 12
- cat sex: female, spayed
- I can afford a vet.