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Frequency sweeepers and em field detectors work on a certain class of bugs, but that class is much less popular these days, because of their serious limitations, short transmit range, and short battery life.
The types of surveillance likely to be installed by a girl probably wouldn't be detected by a frequency sweep, unless she has an accomplice living nearby that can receive a short range radio transmission. Again, in that case, you would be looking for something like an appliance, a lamp or clock radio, something plugged in to provide power for the transmitter.
Something like a nannycam bear that stored collected surveillance on a mem card is more likely - a girl could buy and place one of those - but someone has to actually physically retreive the mem card.
All in all - none of these things are super likely.
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