At a meeting involving Reading East MP Rob Wilson, senior representatives from Crossrail, Network Rail and First Great Western (FGW), Mrs May shared her views on extending the service.
Crossrail is due to come to Maidenhead in 2019 and will provide a direct service to central London stations.
The Home Secretary and Mr Wilson agreed that semi-fast Crossrail services should be run alongside those already offered by FGW.
"There are clear benefits to extending Crossrail for my constituents in Twyford," said Mrs May, who is MP for Maidenhead and Twyford.
"I am pleased that this is being given very serious consideration and I hope that we will hear more about this soon."
The meeting was held to discuss the progress of Crossrail, its implications for Maidenhead and the possibility of its extension to Twyford and Reading at the House of Commons on Tuesday, January 7.
"I am sure they were left in no doubt about my view that Crossrail must complement the existing FGW services, not replace them," said Mrs May.
Royal Borough councillor Geoff Hill (Con, Oldfield) said yesterday (Wednesday) he believes getting Crossrail set up in Maidenhead remain the priority.
"Maidenhead must come first," he said.
He added once that is up and running, extending the line to Twyford and Reading could then be considered.
Wokingham borough councillor Lindsay Ferris (Lib Dem, Twyford), agreed with Mrs May.
"My view has always been that finishing Crossrail at Maidenhead did not make a lot of sense," he said."
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