In the context of giving advice, which phrase is regarded as correct?

In the context of giving advice, the phrase "I told her to call back next week" is appropriate because it effectively communicates a directive while still maintaining a supportive tone. This construction clearly indicates that the speaker is giving advice or guidance, emphasizing the action the recipient should take (in this case, calling back next week). Moreover, using "told" here implies a sense of responsibility and direct communication, which can be important in certain advising contexts.

The other phrases have some grammatical issues or do not convey advice in the clearest manner. For instance, "I advised her returning to the clinic" is not grammatically correct as it should use the infinitive form ("to return") instead of the gerund ("returning"). "I recommend her to call back" is also incorrect because it lacks the proper structure in English; typically one would say "I recommend that she call back." Similarly, while "I suggested she return tomorrow" is a valid phrase, it may not be as direct and specific in comparison to the chosen sentence, which gives a clear timeline (next week) for the action. Thus, "I told her to call back next week" stands out as the most effective option for giving advice.