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Hi thank you for your message, so this would just be for your mother to visit? For ease of conversation I will refer to your biological mother as "mother" and adopted mother as "adopted mother".
Hi thank you for your message, I understand, if this is just for a visit then the mother will need a visitor visa this can be applied for online and will cost £94 it will allow her to visit the UK for up to 6 months. The application can be done here: https://www.gov.uk/standard-visitor-visa/apply
I hope this helps, if you can please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.
Hi thank you for your message, you have asked a question about getting a mother on a visit which I have responded too, yes this can be done, the way to do this is via a visitor visa. I have explained how long this lasts and how much it costs, the link to apply is above. I do not do calls through this service, in any event the payment failed for the call and I have answered your question anyway. With this in mind, please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.