As far as you are concerned:
- About driving through France and coming home: you should ask this to the Belgian Foreign Affairs.
- The risk to which you could expose your daughter: In theory, yes. Risk is linked to the area where you stayed in Spain (Covid19 epicenter or not). How have you been feeling the past 15 days ? Have you complied to the lockdown regulations in Spain ? Do you believe you have been in contact with infected or ill persons or not (knowing that it is estimated that 40 to 50% of the infected persons show no symptoms)?
- Also, due to the unavailability of screening tests, it is wise to quarantine yourself for 15 days upon your return.