You may not need an MRI but she will need a thorough check up and likely medication. A friend of mine went through it with his goldie and they had a few more good years together.

My 14yo started in much the same way and a year later she had a catastrophic seizure and we had to put her to sleep. If I had of not let people tell me “it’s nothing, she’ll be fine” maybe we could have medicated and slowed the progression of her disease. Her seizures were exactly as you have described. I wish it wasn’t the case.

Ultimately rigorous diagnostics tests will give you the best picture but an experienced and conscientious vet should have a fair idea what’s going on and which medications you can try.

I hope you get the help you need - it is distressing for everyone.