u/Diligent_Isopod_3211

So my friend gave me this starter in April. She got hers from someone else so it's around 2 years old. I was getting really dense bread and it wasn't rising very well, took around 2 days to double. I did some research and decided to feed it with rye flour. I went on holiday on the 8th, fed it 1:1:1 with the rye flour and kept it in the fridge. It was about double when i came back yesterday. I fed it again yesterday and kept it on the counter and there was no rise. Fed it this morning and kept it out and no rise. Is it dead or should i go back to bread flour and try again? I'm in the UK so it's around 10°C outside now. Is that a factor?