Did I Disrespect My Girlfriend’s Mum Without Knowing?

Posting this on behalf of someone

I just need some neutral opinions on something that happened between me and my girl.

On her 18th birthday, I posted her picture on my DP and wrote a simple birthday message: “grow and be wise.” To me, it was just a normal blessing/prayer.

Later on, her mum told her that my caption meant I was indirectly saying she’s not mature. Because of that, my girl wasn’t happy with what I wrote.

Fast forward to yesterday — we were already rounding up our conversation because I told her I had an interview in the next 1 hour and 30 minutes. She even said “I wish you all the best.”

At that point, I said something like:

“I wanted to say ‘grow and be wise’ again, but if I do, you won’t be happy. The last time I said it, your mum sent you to attack me.”

I didn’t mean it in a disrespectful way. I only said it because I didn’t want another misunderstanding like the last time. But now that I think about it, the wording might have sounded somehow.

No matter how i try to explain that I meant it in a good way, she totally dont want to take it, this has lasted for three days now. My frustration is that, i only meant good for her but she is saying that bringing her mum up means i an disrespecting her

So my question is: Did I actually disrespect her mum with that statement, or was it just a poor choice of words out of frustration?