Hello
Please get that tooth extracted as there is no enough space for it to erupt. Visit a dentist and post an x ray evaluation the dentist would guide you through. Till then please tell her to rinse her mouth with warm saline or salt water rinses.
Next Steps
Visit a dentist and post x ray get that extracted if required as you said not enough space to erupt.
Health Tips
Visit the dentist ASAP and get this sorted