As of now you need not worry. You must fallow a wait and watch policy.Removal not adviced right now.
Next Steps
lipoma is an innocent swelling.turning into a cancerous state is rare ,less than 95%.You watch for rapid increase in size in a span of short time,any pain,itching ,bleeding ,becoming hard which indicate turning into cancerous condition when removal is adviced.
removal if small is done as an outpatient procedure under local anaesthesia if she tolerates.