Missing piece of land

Hey everybody,

This is probably an odd request, but my grandmother is actually the one who plays this game I have no experience whatsoever, but playing this game is basically all she does and all that keeps her happy sooo... recently she accidentally removed a piece of expansion land, again I'm not familiar with with the game but from what she told me it's one of those pieces that you can't do nothing unless you spend some materials to unlock it and be able to do something with that piece of land. So my grandmother is really upset because she had that specific piece of land surrounded by rocks which made it all look pretty or something, so I was wondering if the game has an option to buy rocks of the sort or undo the unlocking done to that specific piece of terrain. Any help would be greatly appreciated. Thanks.Attachment 103172 this is an image of kind of what I'm talking about the strawberries were surrounded on the inside by rocks and those trees were left in the middle, again any help or information on this I'd really be thankful.

A friend of mine have just expanded a piece of land using 15 of each tool.but the land never opened up.all tools were used up.the account holder details: FARM NAME...TWINSHARK level 49 player.its the L-shape piece where the sugar mill is.