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We do not know what her plan was.

She was clearly not completely brainwashed by the High Sparrow as evidence when she gave Olenna the rose drawing. It is possible that she did not have a plan and was just trying to tell her grandmother that it was not safe to stay as Margaery might have known the High Sparrow was going to try to go after Olenna as well.

However, her interaction after Loras has the symbol carved into his head impies she did have a plan:

Maergry: You mutilated him, you gave me your word.

 

High Sparrow: I've kept my word. Once the Queenmother's trial is concluded, Brother Loras is free to leave.

In all reality, whatever her plans were, they do not matter now;

Seeing as everyone is dead...

We do not know what her plan was.

She was clearly not completely brainwashed by the High Sparrow as evidence when she gave Olenna the rose drawing. It is possible that she did not have a plan and was just trying to tell her grandmother that it was not safe to stay as Margaery might have known the High Sparrow was going to try to go after Olenna as well.

However, her interaction after Loras has the symbol carved into his head impies she did have a plan:

Maergry: You mutilated him, you gave me your word.

High Sparrow: I've kept my word. Once the Queenmother's trial is concluded, Brother Loras is free to leave.

In all reality, whatever her plans were, they do not matter now;

Seeing as everyone is dead...

We do not know what her plan was.

She was clearly not completely brainwashed by the High Sparrow as evidence when she gave Olenna the rose drawing. It is possible that she did not have a plan and was just trying to tell her grandmother that it was not safe to stay as Margaery might have known the High Sparrow was going to try to go after Olenna as well.

However, her interaction after Loras has the symbol carved into his head impies she did have a plan:

Maergry: You mutilated him, you gave me your word.

High Sparrow: I've kept my word. Once the Queenmother's trial is concluded, Brother Loras is free to leave.

In all reality, whatever her plans were, they do not matter now;

Seeing as everyone is dead...

We do not know what her plan was.

She was clearly not completely brainwashed by the High Sparrow as evidence when she gave Olenna the rose drawing. It is possible that she did not have a plan and was just trying to tell her grandmother that it was not safe to stay as Margaery might have known the High Sparrow was going to try to go after Olenna as well.

However, her interaction after Loras has the symbol carved into his head impies she did have a plan:

Maergry: You mutilated him, you gave me your word.

High Sparrow: I've kept my word. Once the Queenmother's trial is concluded, Brother Loras is free to leave.

In all reality, whatever her plans were, they do not matter now;

Seeing as everyone is dead...

We do not know what her plan was.

She was clearly not completely brainwashed by the High Sparrow as evidence when she gave Olenna the rose drawing.

  It is also possible that she did not have a plan and was just trying to tell her grandmother that it was not safe to stay as Margaery might have known the High Sparrow was going to try to go after Olenna as well.

In all reality, whatever her plans were, they do not matter now;

Seeing as everyone is dead...

We do not know what her plan was.

She was clearly not completely brainwashed by the High Sparrow as evidence when she gave Olenna the rose drawing. It is possible that she did not have a plan and was just trying to tell her grandmother that it was not safe to stay as Margaery might have known the High Sparrow was going to try to go after Olenna as well.

However, her interaction after Loras has the symbol carved into his head impies she did have a plan:

Maergry: You mutilated him, you gave me your word.

High Sparrow: I've kept my word. Once the Queenmother's trial is concluded, Brother Loras is free to leave.

In all reality, whatever her plans were, they do not matter now;

Seeing as everyone is dead...