Trierweiler was hospitalised for a week after news broke of Hollande's affair with 41-year-old French actress Julie Gayet, and has since been holed up in a presidential retreat outside Paris as her future remains unclear.
She will visit Mumbai for two days from Monday on a trip organised by French relief organisation Action Against Hunger (ACF) which had been planned long in advance.
Trierweiler, who left hospital last Saturday where she was treated for a bout of "tiredness" brought on by the scandal, had been invited in her official capacity, said ACF.
In Mumbai, Trierweiler will visit a hospital where ACF has a feeding project for malnourished children and witness a training programme for medical staff.
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She will lunch with the wives of top local businessmen and then attend a charity gala dinner at the city's posh Taj Mahal hotel. A news conference is also planned but Trierweiler may not address the media, ACF said.
She will be shown around the city by French actress Charlotte Valandrey, who is involved in the cause of promoting organ donations and transplants.
Giffard remained evasive on the question of whether they would split, saying: "The president and my client are thinking. The decision is theirs alone. It is very difficult for Valerie Trierweiler to remain calm in the face of this media and political pressure. But she is aware that a clarification is necessary."
But Trierweiler reacted furiously to the lawyer's remarks and chastened Giffard for speaking without her permission.