does money in a pension count towards savings and affect WTC

Asking for a friend, as I dont understand the benefit rules and having googled it am still none the wiser. If someone has money in a private pension, does that count as savings when claiming WTC?

Friend is also looking to pay more in to a pension, as she is 62, and has no provision for a pension other than state pension. She has a pension forecast that says she will get full state pension. She works full time, and gets money for her disability, DLA I believe at the lower level, as she has eyesight problem that limit her vision and eventually she will lose all her sight.

She is looking at putting money in to a pension, but is not sure how it would affect her benefits. Currently she does not claim anything other than DLA, but is a low earner. She looked on the entitledto website and that said she would be entitled to around £20/week of WTC.

Would any money she puts in to a private pension reduce any WTC she might be entitled to?

Thanks for your help