Thank-you for your question. In order for your adult daughter (note: I am assuming she is an adult since she has a 1 year old son but please correct me if I am mistaken) to settle in the United Kingdom she would have to apply for indefinite leave to remain as the dependent relative of a person present and settled in the UK under rule 317 of the Immigration Rules. There are various requirements that she would have to meet, including showing that she is "living alone outside the United Kingdom in the most exceptional compassionate circumstances and mainly dependent financially on relatives settled in the United Kingdom" and "has no other close relatives in her own country to whom she could turn for financial support". From the information that you have provided it seems unlikely that your daughter would be able to satisfy these requirements.
However, British citizenship may descend to one generation born abroad. So if you are a British citizen (otherwise than by descent) and your daughter was born outside the United Kingdom then she will be a British citizen by descent. She can apply for a British passport and, upon receipt of the same, will be able to enter and stay in the United Kingdom without any restrictions.
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